Python 如何检查数组中的值是否为Null(None)?
我的代码:Python 如何检查数组中的值是否为Null(None)?,python,python-3.x,list,null,nul,Python,Python 3.x,List,Null,Nul,我的代码: import random print("AI THAT WILL FIND OUT YOUR 5 letter text") ttt = input() fin = False lenof = 25 s = 0 used = [] lol = False used = [] five = ['a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's'
import random
print("AI THAT WILL FIND OUT YOUR 5 letter text")
ttt = input()
fin = False
lenof = 25
s = 0
used = []
lol = False
used = []
five = ['a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z']
while fin == False:
for i in five:
ran = random.randint(s,lenof)
r = five[ran]
ran1 = random.randint(s,lenof)
r = r + five[ran1]
ran2 = random.randint(s,lenof)
r = r + five[ran2]
ran3 = random.randint(s,lenof)
r = r + five[ran3]
ran4 = random.randint(s,lenof)
r = r + five[ran4]
e = r
if r == ttt:
fin = True
lol = True
print(">> " + r)
elif r != ttt and lol == False and used.index(r) is None:
print("> " + r)
used.append(e)
错误:
File "<string>", line 38, in <module>
ValueError: 'ntzhk' is not in list
那么,您能告诉我如何检查数组中的值是否为None吗
我需要改变什么吗
我补充说,这样程序就不会重复相同的随机字母
谢谢 而不是:
used.index(r) is None
您可以通过以下方式直接检查是否存在:
r not in used
使用时显示错误。如果找不到,indexr不会返回None。而不是used.indexr为None do r not used。您不是在检查列表中的值是否为None,而是在尝试检查该值是否在数组中。程序员您好,请在编写下一个问题之前先熟悉一下!祝您在SO逗留愉快: