write to existing text file python code example

Example 1: python append to file

with open(filename, "a+") as f:
  f.write('Hello World')

Example 2: how to write a python variable to a file

#use pickle

import pickle
dict = {'one': 1, 'two': 2}
file = open('dump.txt', 'w')
pickle.dump(dict, file)
file.close()

#and to read it again
file = open('dump.txt', 'r')
dict = pickle.load(file)