why only first line of file python is print code example

Example 1: get first line of file python

with open('myfile.txt') as f:
    first_line = f.readline()

Example 2: read only the first line python

""" Read only the first line of a file """

with open('file.txt') as f:
    first_line = f.readline()
    print(first_line)
    
""" or """

f = open ('file.txt', 'r')
first_line = f.readline()
print (first_line)