CN112328231B - Quick conversion method between python dictionary and structure - Google Patents
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Abstract
The invention discloses a rapid conversion method between a python dictionary and a structural body, which comprises the following steps: s1, building a python environment; s2, constructing a conversion file in the python environment; s3, creating a first function and a second function for mutual conversion of the dictionary and the structural body in the conversion file; s4, utilizing a structural body definition example M to be converted, after assigning the value to the M, calling the first function to convert the assigned M into a dictionary a, namely, realizing a structural body conversion dictionary; s5, clearing the assignment of M, and calling the second function to assign the value in the dictionary a to the structure to be converted, namely, the assignment of the dictionary to the structure is realized. The method adopts a unified function to realize the mutual conversion between the dictionary and the structure body, greatly improves the development efficiency, enhances the robustness of codes, reduces the maintenance cost and reduces the workload of secondary development.
Description
Technical Field
The invention relates to the technical field of data processing, in particular to a rapid conversion method between a python dictionary and a structural body.
Background
Python is an object-oriented, interpreted computer programming language, invented by Guidovan Rossum in the end of 1989, the first published release was published in 1991. Python grammar is simple and clear, and has rich and powerful class library.
Many of the current web frameworks implemented based on python involve processing data with python in a server client model, most of the web and client interaction data uses json format to transfer data, but if the underlying function of the server is implemented in c language, this situation usually requires invoking a dynamic library of c using ctypes library with python to implement data interaction, this time involves the process of converting the structural assignment of dictionary and ctypes to each other, and the conventional operation is to assign each element in the structural body to the dictionary separately or to take out from the dictionary to assign each element in the structural body to each other, that is, assign each element to each data type in sequence, so that development efficiency is low and error is easy, and if the structural body adds an element or deletes an element, the code for converting these two data formats to each other must be modified, maintenance cost is extremely high, and code robustness is extremely poor, so a simple method for converting these two data formats to each other is urgently needed.
Disclosure of Invention
It is an object of the present invention to solve at least the above problems and to provide at least the advantages to be described later.
It is still another object of the present invention to provide a rapid conversion method between a python dictionary and a structure, which uses a unified function to implement the conversion between the dictionary and the structure, thereby greatly improving the development efficiency, enhancing the robustness of codes, reducing the maintenance cost, and reducing the workload of secondary development.
To achieve these objects and other advantages and in accordance with the purpose of the invention, a rapid conversion method between a python dictionary and a structure is provided, comprising the steps of:
s1, building a python environment;
s2, constructing a conversion file in the python environment;
s3, creating a first function and a second function for mutual conversion of the dictionary and the structural body in the conversion file;
s4, utilizing a structural body definition example M to be converted, after assigning the value to the M, calling the first function to convert the assigned M into a dictionary a, namely, realizing a structural body conversion dictionary;
s5, clearing the assignment of M, and calling the second function to assign the value in the dictionary a to the structure to be converted, namely, the assignment of the dictionary to the structure is realized.
Preferably, in the rapid conversion method between the python dictionary and the structure, after the first function is called in S4 to convert the assigned M into the dictionary a, whether the result returned by the first function is correct needs to be verified, and if yes, the step goes to S5; if not, recreating the first function;
s5, after the second function is called to assign the value in the dictionary a to the structure to be converted, whether the value of the member in the structure to be converted after the assignment is correct is also verified, and if yes, the dictionary and the structure are converted with each other by adopting the first function and the second function subsequently; and if not, recreating the second function.
Preferably, in the rapid conversion method between the python dictionary and the structure, in S1, the python environment includes a python ctypes library.
Preferably, in the rapid conversion method between the python dictionary and the structure, the conversion is performed only when the names of the dictionary keys and the structure members are identical.
Preferably, in the rapid conversion method between the python dictionary and the structure, before the conversion, the data types of the members in the structure and the data types used in the dictionary are respectively classified according to different assignment modes, and a corresponding relation is established between the classified data types of the members and the classified data types used in the dictionary.
Preferably, in the method for fast conversion between the python dictionary and the structure, in S3, the method for constructing the first function specifically includes:
s1-1, circularly acquiring all members in a structure body, and respectively determining the types of all members according to the data types of the classified members;
s1-2, obtaining the value of each member by using a getattr function in a python dictionary;
and S1-3, performing assignment processing on each member according to the type of the member determined in the S1-1.
Preferably, in the rapid conversion method between the python dictionary and the structure, in S1-1, when the member in the structure obtained in a circulating manner is still the structure, the obtained structure is again obtained in a circulating manner; when the members in the structure body obtained in a circulating way are arrays, performing corresponding processing on the elements in the arrays according to the data types of the members after corresponding classification; when the member of the structure body obtained in a circulating way is other members except the structure body and the group, the assignment processing is directly carried out on the member.
Preferably, in the rapid conversion method between the python dictionary and the structure, before S1-1, whether the parameter type of the structure is wrong or not is verified by using an instance function in the python dictionary, if yes, the instance function is ended and an empty dictionary is returned; and if not, circularly acquiring all members in the structural body by using the file attribute of the structural body.
Preferably, in the method for fast conversion between the python dictionary and the structure, in S3, the method for constructing the second function specifically includes:
s2-1, circularly acquiring the value and keys of the dictionary;
s2-2, judging whether the names of the members in the structure are the same as the names of the keys of the dictionary by utilizing the getattr function cooperation and the exception handling mechanism of the python dictionary, if so, judging the types of the values of the members corresponding to the keys by utilizing the Isinstance function of the python, and assigning the values of the members corresponding to the keys to the members according to the corresponding relation; if not, continuing the judgment of the name of the next member in the structure.
Preferably, in the rapid conversion method between the python dictionary and the structure, in S2-1, when the value of the dictionary obtained in a circulating way is still the dictionary, the obtained dictionary is again obtained in a circulating way; when the value of the dictionary obtained in a circulating way is a list, continuing to circulate the elements in the list, and carrying out corresponding assignment processing according to the type of the elements; when the type of the key of the dictionary obtained in the cycle in the structure is a character string, the data is directly assigned.
The invention at least comprises the following beneficial effects:
in the rapid conversion method between the python dictionary and the structural body, the environment above python2.7 is built, then the python conversion file is written, then the first function struct_to_direct and the second function struct_to_struct are created, the structural body conversion dictionary is realized by calling the struct_to_direct, and the dictionary assignment to the structural body is realized by calling the struct_to_struct function, namely, the automatic assignment to the structural body from the dictionary by adopting a unified function is realized, the structural body assignment to the dictionary is realized, and independent operation for each element in the structural body is not needed, so that the development efficiency is greatly improved, and the program robustness is enhanced.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention.
Drawings
FIG. 1 is a block diagram of a rapid conversion method between a python dictionary and a structure according to the present invention.
Detailed Description
The present invention is described in further detail below with reference to the drawings to enable those skilled in the art to practice the invention by referring to the description.
It will be understood that terms, such as "having," "including," and "comprising," as used herein, do not preclude the presence or addition of one or more other elements or groups thereof.
The invention provides a rapid conversion method between a python dictionary and a structural body, which comprises the following steps:
s1, building a python environment;
s2, constructing a conversion file in the python environment;
s3, creating a first function and a second function for mutual conversion of the dictionary and the structural body in the conversion file;
s4, utilizing a structural body definition example M to be converted, after assigning the value to the M, calling the first function to convert the assigned M into a dictionary a, namely, realizing a structural body conversion dictionary;
s5, clearing the assignment of M, and calling the second function to assign the value in the dictionary a to the structure to be converted, namely, the assignment of the dictionary to the structure is realized.
In the scheme, firstly, setting up an environment above python2.7, then writing a python conversion file, then creating a first function struct_to_subject and a second function struct_to_struct, realizing a structure body conversion dictionary by calling the struct_to_subject, and realizing dictionary assignment to the structure body by calling the struct_to_struct function, namely realizing that a unified function is adopted to automatically assign values to the structure body from the dictionary and assign the structure body to the dictionary, and each element in the structure body is not required to be independently operated, thereby greatly improving development efficiency and enhancing program robustness.
In a preferred scheme, after the first function is called in the step S4 to convert the assigned M into the dictionary a, whether the result returned by the first function is correct or not needs to be verified, and if yes, the step S5 is carried out; if not, recreating the first function;
s5, after the second function is called to assign the value in the dictionary a to the structure to be converted, whether the value of the member in the structure to be converted after the assignment is correct is also verified, and if yes, the dictionary and the structure are converted with each other by adopting the first function and the second function subsequently; and if not, recreating the second function.
In the scheme, whether the constructed first function and the constructed second function are correct or not can be verified by verifying the correctness of the returned result, and further after verification is passed, the first function and the second function can be adopted to realize automatic conversion between the dictionary and the structure body.
In a preferred embodiment, in S1, the python environment comprises a python ctypes library.
In the scheme, the first function and the second function are created through the constructed conversion file and the python ctypes library.
In a preferred embodiment, the dictionary keys and the members of the structure are mutually converted when they are identical in name.
In the scheme, the consistency of the names of the dictionary keys and the structural members is the basis of the mutual conversion and assignment between the dictionary and the structural members.
In a preferred scheme, before the mutual conversion, the data types of the members in the structure body and the data types used in the dictionary are respectively classified according to different assignment modes, and a corresponding relation is established between the classified data types of the members and the classified data types used in the dictionary.
In the above scheme, the main difference of the classification is that the assignment modes are different, such as c_ui, c_ubyte, c_char in the structure body, and these can be directly classified into one class by adopting equal number assignment, the array in the structure body corresponds to the list in the dictionary, this is one class, this class needs to judge the data type in turn by using a for loop and adopts corresponding mode assignment, the substructure in the structure body corresponds to one dictionary in the dictionary, this class needs to call back this method implemented by us to reprocess the assignment.
In a preferred embodiment, in S3, the method for constructing the first function specifically includes:
s1-1, circularly acquiring all members in a structure body, and respectively determining the types of all members according to the data types of the classified members;
s1-2, obtaining the value of each member by using a getattr function in a python dictionary;
and S1-3, performing assignment processing on each member according to the type of the member determined in the S1-1.
In a preferred scheme, in S1-1, when the member in the structure body obtained in a circulating way is still the structure body, the obtained structure body is obtained in a circulating way again; when the members in the structure body obtained in a circulating way are arrays, performing corresponding processing on the elements in the arrays according to the data types of the members after corresponding classification; when the member of the structure body obtained in a circulating way is other members except the structure body and the group, the assignment processing is directly carried out on the member.
In the scheme, if the member in the structure body is still the structure body, the function is called back to continue processing; if the element of the structure is an array and the elements in the array are circulated, corresponding processing actions are continuously adopted according to the classification; and otherwise, directly giving the assignment, circularly processing all the elements and ending the function and returning the function to the dictionary.
In a preferred scheme, before S1-1, whether the parameter type of the structure body is wrong or not is verified by using an Isinstance function in a python dictionary, if so, ending the Isinstance function and returning to an empty dictionary; and if not, circularly acquiring all members in the structural body by using the file attribute of the structural body.
In the above scheme, firstly, the python's instance function is used to judge whether the parameter type is wrong, if the parameter is not the type of the parameter which we need, the wrong prompt message can be printed and the function is finished to return to the empty dictionary. If the parameters are legal, the next step is to circularly acquire all members in the structure body by utilizing the file attributes of the structure body.
In a preferred embodiment, in S3, the method for constructing the second function specifically includes:
s2-1, circularly acquiring the value and keys of the dictionary;
s2-2, judging whether the names of the members in the structure are the same as the names of the keys of the dictionary by utilizing the getattr function cooperation and the exception handling mechanism of the python dictionary, if so, judging the types of the values of the members corresponding to the keys by utilizing the Isinstance function of the python, and assigning the values of the members corresponding to the keys to the members according to the corresponding relation; if not, continuing the judgment of the name of the next member in the structure.
In the scheme, before S2-1, whether the parameter type of the structural body is wrong or not is verified by using an Isinstance function of python, if yes, the Isinstance function is ended, and error information is returned; if not, the dictionary value and key are circularly obtained, namely, firstly, the python's Isnstance function is utilized to judge whether the parameter type is wrong, if the parameter is not the parameter type needed by us, the wrong prompt information is printed and the function is ended, the False is returned, if the parameter is legal, the value and key of the dictionary are circularly obtained, and if the member with the same name as the key of the dictionary is obtained in the structure body by using the getattr function of the python dictionary in combination with an exception handling mechanism, if the member is not present, the value in the dictionary is not processed, and the next element is continued, if the member is present in the structure body, the python dictionary is utilized to judge the type of the value corresponding to the key in the dictionary, and the type is judged according to the classification, and the value of the member corresponding to the key is assigned to the member according to the corresponding relation.
In a preferred scheme, in S2-1, when the value of the dictionary obtained in a circulating way is still the dictionary, the obtained dictionary is again obtained in a circulating way; when the value of the dictionary obtained in a circulating way is a list, continuing to circulate the elements in the list, and carrying out corresponding assignment processing according to the type of the elements; when the type of the key of the dictionary obtained in the cycle in the structure is a character string, the data is directly assigned.
In the above scheme, if the value of the dictionary is the dictionary, the acquired dictionary needs to be circularly acquired again; if the dictionary value is a list, continuing to circulate the elements in the list, and taking corresponding processing actions according to the types of the elements belonging to the classification; the type of the key of the dictionary in the structure body is a character string, and then the value is directly assigned; and in other cases, the direct assignment processing of the shaping processing is unified, and finally, the data is assigned by using the setattr function of python.
Although embodiments of the present invention have been disclosed above, it is not limited to the details and embodiments shown and described, it is well suited to various fields of use for which the invention would be readily apparent to those skilled in the art, and accordingly, the invention is not limited to the specific details and illustrations shown and described herein, without departing from the general concepts defined in the claims and their equivalents.
Claims (3)
1. A method for rapid conversion between a python dictionary and a structure, comprising the steps of:
s1, building an environment above python 2.7;
s2, constructing a conversion file in the python environment;
s3, creating a first function and a second function for mutual conversion of the dictionary and the structural body in the conversion file;
s4, utilizing a structural body definition example M to be converted, after assigning the value to the M, calling the first function to convert the assigned M into a dictionary a, namely, realizing a structural body conversion dictionary;
s5, clearing the assignment of M, and calling the second function to assign the value in the dictionary a to the structure to be converted, namely, the assignment of the dictionary to the structure is realized;
wherein in S1, the python environment comprises a python ctypes library; the dictionary can be converted with each other only when the names of the dictionary keys and the structural members are consistent; before mutual conversion, the data types of the members in the structure body and the data types used in the dictionary are respectively classified according to different assignment modes, and a corresponding relation is established between the classified data types of the members and the classified data types used in the dictionary;
s3, the construction method of the first function specifically comprises the following steps:
s1-1, circularly acquiring all members in the structure body, and respectively determining all members according to the data types of the classified members
The type of member;
s1-2, obtaining the value of each member by using a getattr function in a python dictionary;
s1-3, performing assignment processing on each member according to the type of the member determined in the S1-1;
s1-1, when the member in the structure body obtained in a circulating way is still the structure body, carrying out circulating obtaining again on the obtained structure body; when the members in the structure body obtained in a circulating way are arrays, performing corresponding processing on the elements in the arrays according to the data types of the members after corresponding classification; when the member of the structure body obtained in a circulating way is other members except the structure body and the group, the member is directly assigned;
s3, the construction method of the second function specifically comprises the following steps:
s2-1, circularly acquiring the value and keys of the dictionary;
s2-2, judging whether the names of the members in the structure are the same as the names of the keys of the dictionary by utilizing the getattr function cooperation and the exception handling mechanism of the python dictionary, if so, judging the types of the values of the members corresponding to the keys by utilizing the Isinstance function of the python, and assigning the values of the members corresponding to the keys to the members according to the corresponding relation; if not, continuing to judge the name of the next member in the structure;
s2-1, when the value of the dictionary obtained in a circulating way is still the dictionary, carrying out circulating obtaining again on the obtained dictionary; when the value of the dictionary obtained in a circulating way is a list, continuing to circulate the elements in the list, and carrying out corresponding assignment processing according to the type of the elements; when the type of the key of the dictionary obtained in the cycle in the structure is a character string, the data is directly assigned.
2. The rapid conversion method between a python dictionary and a structure according to claim 1, wherein after the first function is called in S4 to convert the assigned M into the dictionary a, it is further verified whether the result returned by the first function is correct, and if yes, the process goes to S5; if not, recreating the first function;
s5, after the second function is called to assign the value in the dictionary a to the structure to be converted, whether the value of the member in the structure to be converted after the assignment is correct is also verified, and if yes, the dictionary and the structure are converted with each other by adopting the first function and the second function subsequently; and if not, recreating the second function.
3. The rapid conversion method between a python dictionary and a structure according to claim 1, wherein before S1-1, it is further required to verify whether the parameter type of the structure is wrong by using an instance function in the python dictionary, if yes, ending the instance function and returning to an empty dictionary; and if not, circularly acquiring all members in the structural body by using the file attribute of the structural body.
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