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Python open reading and writing files to implement script code display
Python open reading and writing files to implement script code display
File operations in Python can be done through the open function, which is indeed very similar to fopen in C language. Obtain a file object through the open function, and then call read(), write() and other methods to read and write the file.
1.open
After using open to open a file, you must remember to call the close() method of the file object. For example, you can use the try/finally statement to ensure that the file can be closed finally.
file_object = open('thefile.txt') try: all_the_text = file_object.read( ) finally: file_object.close( )
Note: The open statement cannot be placed in the try block, because when an exception occurs when opening the file, the file object file_object cannot execute the close() method.
2. Read files
Read text files
input = open('data', 'r') #第二个参数默认为r input = open('data')
Read binary files
input = open('data', 'rb')
Read all contents
file_object = open('thefile.txt') try: all_the_text = file_object.read( ) finally: file_object.close( )
Read fixed bytes
file_object = open('abinfile', 'rb')
try:
while True:
chunk = file_object.read(100)
if not chunk:
break
do_something_with(chunk)
finally:
file_object.close( )Read each line
list_of_all_the_lines = file_object.readlines( )
If the file is a text file, you can also directly traverse the file object to obtain each line:
for line in file_object:
process line3. Write file
Write text file
output = open('data', 'w')
Write binary file
output = open('data', 'wb')
Append write file
output = open('data', 'w+')
Write Data
file_object = open('thefile.txt', 'w') file_object.write(all_the_text) file_object.close( )
Write multiple lines
file_object.writelines(list_of_text_strings)
Note that calling writelines to write multiple lines will have higher performance than using write to write in one go.
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