How to read and write Python text File and csv File
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1. Reading and writing of text files 1 read () method file_object.read ([size]) of reading files
File_object represents a file object
Size indicates the length of the read data in bytes, or read to the end of the file if omitted by size
The return value is the read string
2 read the readline () method file_object.readline ([size]) of the file
Size indicates the length of the read data in bytes, or read to the end of the file if omitted by size
The return value is the read string
Read by line
3 read the readlines () method file_object.readlines ([sizehint]) of the file
Sizehint indicates the length of the read data in bytes, or read to the end of the file if omitted by size
The return value is the list of strings read, and the line in the file will be used as an element in the list
4 write () method file_object.write (str) 5 write file writelines () method file_object.writelines (sequence)
Each element in the sequence will act as a line in the file
If there is a newline character at the end of each line in the file, it is determined in the sequence element before writing
II. Reading and writing of csv files
Binary files are read the same as write and text files, as long as the open mode "b" is specified when the file is opened
1 the csv.reader () method of reading csv files
Csv.reader (file_object)
2 the csv.DictReader () method of reading csv files
Csv.DictReader (file_object)
3 csv.writer () method of writing csv file
Csv.writer (file_object)
4 csv.DictWriter () method of writing csv file
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