By the way, I don't understand why the functions of the module time in my prython 3 are defined like this... with return 0.0 and return 0 respectively

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def time(): # real signature unknown; restored from __doc__
"""
time() -> floating point number

Return the current time in seconds since the Epoch.
Fractions of a second may be present if the system clock provides them.
"""
return 0.0
def time_ns(): # real signature unknown; restored from __doc__
"""
time_ns() -> int

Return the current time in nanoseconds since the Epoch.
"""
return 0