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import itertools
import random
from scipy.special import comb, perm
'''
这个方法比较方便快捷，但是比较消耗内存，内存不大，会内存溢出
'''
def products(length=5):
chars = ''.join([chr(i) for i in range(32, 127)])
for i in itertools.product(chars, repeat=length):
string = ''.join(i)
print(string)
'''
这个方法运行速度快，但是容易遗漏
'''
def random_str(code_len=5):
chars = ''.join([chr(i) for i in range(32, 127)])
code_count = int(comb(len(chars), code_len))
count = 0
while count < code_count:
checkcode = ''
for i in range(code_len):
j = random.randint(0, len(chars) - 1)
checkcode += chars[j]
print(checkcode)
count += 1
'''
这个方法综合前两种，内存消耗不大，运行速度一般
'''
def sub_list(length=5):
chars = [chr(j) for i in range(length) for j in range(32, 127)]
for i in range(1 << len(chars)):
combo_list = []
for j in range(len(chars)):
if i & (1 << j):
combo_list.append(chars[j])
sub_list_len = len(combo_list)
if sub_list_len != length:
continue
else:
sub_str = ''.join(combo_list)
print(sub_str)
def main():
products()
random_str()
sub_list()
if __name__ == '__main__':
products()
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