PythonFile Open
Open a File on the Server
Assume we have the following file, located in the same folder as Python:
demofile.txt
This file is for testing purposes.
Good Luck!
To open the file, use the built-inopen() function.
Theopen() function returns a file object, which has aread() method for reading the content of the file:
If the file is located in a different location, you will have to specify the file path, like this:
Example
Open a file on a different location:
print(f.read())
Using thewith statement
You can also use thewith statement when opening a file:
Then you do not have to worry about closing your files, thewith statement takes care of that.
Close Files
It is a good practice to always close the file when you are done with it.
If you are not using thewith statement, you must write a close statement in order to close the file:
Example
Close the file when you are finished with it:
print(f.readline())
f.close()
Note: You should always close your files. In some cases, due to buffering, changes made to a file may not show until you close the file.
Read Only Parts of the File
By default theread() method returns the whole text, but you can also specify how many characters you want to return:
Example
Return the 5 first characters of the file:
print(f.read(5))
Read Lines
You can return one line by using thereadline() method:
By callingreadline() two times, you can read the two first lines:
Example
Read two lines of the file:
print(f.readline())
print(f.readline())
By looping through the lines of the file, you can read the whole file, line by line:
Example
Loop through the file line by line:
for x in f:
print(x)
