gistfile1.txt

$ cat x.py
import sys
import typing
for i in range(1000):
    del sys.modules['typing']
    import typing

$ time python3 x.py

real    0m11.392s
user    0m11.232s
sys    0m0.131s

# Importing typing module takes 11ms

$ python3 -m cProfile -stime x.py
         8207297 function calls (8206201 primitive calls) in 9.639 seconds

   Ordered by: internal time

   ncalls  tottime  percall  cumtime  percall filename:lineno(function)
   106106    2.863    0.000    2.863    0.000 {built-in method __new__ of type object at 0x10e3f5650}
   237237    1.327    0.000    1.327    0.000 _weakrefset.py:36(__init__)
    79079    1.065    0.000    7.606    0.000 abc.py:132(__new__)
  1830829    0.845    0.000    0.845    0.000 {built-in method builtins.getattr}
     1001    0.793    0.001    0.793    0.001 {built-in method marshal.loads}
    65065    0.600    0.000    7.751    0.000 {built-in method builtins.__build_class__}
  2493498    0.493    0.000    0.493    0.000 {built-in method builtins.isinstance}
  1482481    0.396    0.000    0.396    0.000 {method 'startswith' of 'str' objects}
    79079    0.194    0.000    0.737    0.000 abc.py:136(<setcomp>)
   534534    0.127    0.000    0.127    0.000 {method 'endswith' of 'str' objects}
   104104    0.078    0.000    0.078    0.000 {built-in method builtins.hasattr}
    88088    0.053    0.000    0.140    0.000 {built-in method builtins.any}
     2002    0.046    0.000    0.046    0.000 {built-in method posix.getcwd}
    89089    0.044    0.000    0.044    0.000 {method 'update' of 'dict' objects}
   280280    0.043    0.000    0.043    0.000 {method 'add' of 'set' objects}
    10010    0.041    0.000    0.081    0.000 functools.py:44(update_wrapper)
     5005    0.038    0.000    0.040    0.000 functools.py:448(lru_cache)
     3003    0.036    0.000    0.123    0.000 <frozen importlib._bootstrap_external>:1233(find_spec)
    40040    0.034    0.000    0.071    0.000 {built-in method builtins.all}
     1001    0.033    0.000    0.059    0.000 <frozen importlib._bootstrap_external>:830(get_data)
    37037    0.032    0.000    0.041    0.000 {built-in method builtins.hash}
     5005    0.032    0.000    0.032    0.000 {built-in method posix.stat}
   145147    0.030    0.000    0.030    0.000 {method 'append' of 'list' objects}
     1001    0.026    0.000    0.026    0.000 {method 'read' of '_io.FileIO' objects}
     1001    0.020    0.000    0.024    0.000 <frozen importlib._bootstrap_external>:430(_validate_bytecode_header)
    79080    0.018    0.000    0.018    0.000 {method 'items' of 'dict' objects}
    99104    0.017    0.000    0.017    0.000 {built-in method builtins.len}
    50050    0.016    0.000    0.016    0.000 {built-in method builtins.setattr}
    16016    0.014    0.000    0.041    0.000 <frozen importlib._bootstrap_external>:57(_path_join)
    16016    0.013    0.000    0.021    0.000 <frozen importlib._bootstrap_external>:59(<listcomp>)
     1001    0.013    0.000    0.213    0.000 <frozen importlib._bootstrap>:861(_find_spec)
     1001    0.011    0.000    0.915    0.001 <frozen importlib._bootstrap_external>:743(get_code)
    27027    0.011    0.000    0.011    0.000 abc.py:9(abstractmethod)
     2002    0.010    0.000    0.021    0.000 <frozen importlib._bootstrap_external>:263(cache_from_source)
     1001    0.010    0.000    0.189    0.000 <frozen importlib._bootstrap_external>:1117(_get_spec)
     5005    0.010    0.000    0.059    0.000 functools.py:479(decorating_function)
...