timeit — 为 python 程序计时

Basic Example

# timeit_example.py
import timeit

# using setitem
t = timeit.Timer("print('main statement')", "print('setup')")

print('TIMEIT:')
print(t.timeit(2))

print('REPEAT:')
print(t.repeat(3, 2))

# A few constants
range_size = 1000
count = 1000
setup_statement = ';'.join([
    "l = [(str(x), x) for x in range(1000)]",
    "d = {}",
])


def show_results(result):
    "Print microseconds per pass and per item."
    global count, range_size
    per_pass = 1000000 * (result / count)
    print('{:6.2f} usec/pass'.format(per_pass), end=' ')
    per_item = per_pass / range_size
    print('{:6.2f} usec/item'.format(per_item))


print("{} items".format(range_size))
print("{} iterations".format(count))
print()