how to delete a files content in python code example

Example 1: clearing all text from a file in python

fileVariable = open('textDocName.txt', 'r+')
fileVariable.truncate(0)
fileVariable.close()

Example 2: how to delete everything on a file python

f = open('file.txt', 'r+')
f.truncate(0) # need '0' when using r+