python2 ascii' codec can't decode byte 0xc2 in position 0: ordinal not in range(128) code example

Example 1: Exception: 'ascii' codec can't decode byte 0xe2 in position 7860: ordinal not in range(128)

f = open(file_path, 'r+', encoding="utf-8")

Example 2: 'ascii' codec can't decode byte 0xc3 ordinal not in range(128)

f = open('../glove/glove.6B.100d.txt', encoding="utf-8")
#encoding is to changes the characters other text