为什么这么写的运行结果是输出了s的前21个字符而不是前20个字符？
s = 'ABCDEFGHIJKLMNOPQRSTUVWXYZ'
num = 0
for ch in s:
if num > 20:
break
num = num + 1
print(ch)
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s = 'ABCDEFGHIJKLMNOPQRSTUVWXYZ'
num = 0
for ch in s:
if num > 20:
break
num = num + 1
print(ch)
2022-01-10
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