import sys
# your code goes hereimport sys
print("Python version")
print (sys.version)
 
def f1():
    a = 'do not make this when f1() is mocked'
    print("should be printed once")
    return 10, True
 
def f2():
    num, stat = f1()
    return 2*num, stat
 
import mock
 
print f2() # Unchanged f1 -> prints (20, True)
 
with mock.patch('__main__.f1') as MockClass: # replace f1 with MockClass 
    MockClass.return_value = (30, True) # change the return value
    print f2() # prints now 60,

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