正确例题 import random s = "1234567890abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ!@#$%^&*()_+=-" n=random.randint(0,len(s)) print(s[n])
正确例题 import random str1='this_a_string_with_several_characters' n=random.randint(0,len(str1)) print(str1[n])
正确例题 import random lst=[0,1,2,3,4,5,6,7,8,9] for i in range(5): a=random.choice(lst) lst.remove(a) print(a,lst)
正确例题 import random z=[0,1,2,3,4,5,6,7,8,9] a=random.choice(z) print(a)
正确例题 import random z= ["a", "b", "c"] a=random.choice(z) print(a)
正确例题 import random z= ["a", "b", "c"] a=random.choice(z) b=random.choice(z) print(a,b)
正确例题 import re m = ["a", "b", "c"] for i in range(0,3): for j in range(0,3): print("%s%s" % ( m[i],m[j]))
aa ab ac ba bb bc ca cb cc
[Process completed - press Enter]
正确例题 import re a="0" b="1" print(a+b)
m = ["a", "b", "c"] print(m)
正确例题 import re z = ["a", "b"] for i in range(0,2): for j in range(0,2): print("%s%s" % ( z[i],z[j]))
aa ab ba bb
[Process completed - press Enter]
正确例题 import re z = ["a", "b"] for i in range(0,2): for j in range(0,2): for k in range(0,2): print("%s%s%s" % ( z[i],z[j],z[k]))
aaa aab aba abb baa bab bba bbb
[Process completed - press Enter]
正确例题 import re z = ["a", "b", "c"] for i in range(0,3): for j in range(0,3): print("%s%s" % ( z[i],z[j]))
正确例题 import re z = ["0", "1", "2", "3", "4", "5", "6", "7", "8", "9"] for i in range(0,2): for j in range(0,2): print("%s%s" % ( z[i],z[j]))
00 01 10 11
[Process completed - press Enter]
正确例题 import re z = ["0", "1", "2", "3", "4", "5", "6", "7", "8", "9"] for i in range(0,2): for j in range(0,2): for k in range(0,2): print("%s%s%s" % ( z[i],z[j],z[k]))
000 001 010 011 100 101 110 111
[Process completed - press Enter]
正确例题 import re z = ["0", "1", "2", "3", "4", "5", "6", "7", "8", "9"] for i in range(0,3): for j in range(0,3): print("%s%s" % ( z[i],z[j]))
00 01 02 10 11 12 20 21 22
[Process completed - press Enter]
正确例题 import re z = ["0", "1", "2", "3", "4", "5", "6", "7", "8", "9"] for i in range(0,3): for j in range(0,3): for k in range(0,3): for l in range(0,3):
for m in range(0,3):
for n in range(0,3):
print("%s%s%s%s%s%s" % ( z[i],z[j],z[k],z[l],z[m],z[n]))
import re z = ["0", "1", "2", "3", "4", "5", "6", "7", "8", "9"] for i in range(0,3): for j in range(0,3): f = file(r'test.txt,'a') print("%s%s" % ( z[i],z[j]))
