import random,string
s=string.ascii_letters+string.digits
print(s)
 
n={''.join(random.choices(s,k=8)) for I in range(60000)}
print(len(n))
 
with open('a.csv','w') as f:
  for i in n:
    f.write(i+'\n')

import random
import string
def generate_random_str(randomlength):  
  '''  
  string.digits = 0123456789  
  string.ascii_letters = 26个小写,26个大写  
  '''  
  str_list = random.sample(string.digits + string.ascii_letters,randomlength)    
  random_str = ''.join(str_list)  
  return random_str

print(generate_random_str(randomlength=20)) #randomlength最大取值为26*2+10=62

import random
import string
file = open('1.txt','w')
for i in range(1000000):  
  random_str = ''.join(random.sample(string.digits *5 +string.ascii_letters*4,255))         
  file.write(random_str + '\n')
file.close()