truncate add weird symbols in python

1To solve the above error Try This:
2  with open('file.txt','r+') as f:
3    # Try to seek the position to 0
4    f.seek(0)
5    f.truncate(0)
6for me it solved the problem
7
8OR
9import fileinput
10
11for line in fileinput.input('file.txt', inplace=1):
12  pass