计数字符在一个变量python

Question

我想创建一个程序来打印一段文本的一定的时间，我想限制第一个文本条目中的字母数量，我不知道如何。

代码：

# Hello World Script 2.0 

import random 
**------------------------------------------------ 
#i want to limit the amount of characters, how? 
------------------------------------------------** 
print("What do you want to be printed?(Max 20 Characters)") 
var0 = input("> ") 

print("Please enter the amount of times you want that printed(max 100000)") 
print('Or enter "R" for a random number') 
var2 = input("> ") 

if int(var2) > 100000: 
    print("That number is too high, please restart the proram and enter something smaller.") 
    exit() 

if var2 == "r": 
    var2 = random.randint(1,100000) 


var1 = var0 * int(var2) 
print(var1, var2) 

Answer 1

你可以检查与功能LEN字符串的长度（）。

import random 
**------------------------------------------------ 
#i want to limit the amount of characters, how? 
------------------------------------------------** 
print("What do you want to be printed?(Max 20 Characters)") 
var0 = input("> ") 

if len(var0) > 20: 
    print("That is too long") 
    exit() 

print("Please enter the amount of times you want that printed(max 100000)") 
print('Or enter "R" for a random number') 
var2 = input("> ") 

if int(var2) > 100000: 
    print("That number is too high, please restart the proram and enter something smaller.") 
    exit() 

if var2 == "r": 
    var2 = random.randint(1,100000) 


var1 = var0 * int(var2) 
print(var1, var2)