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题目的要求是每个找出str1中 的小写字母 且这个小写字母左右两边均有且仅有3个大写字母
我的程序是这样的
def count(x):
list1 = []
str2 = ''
lenth = len(x)
for i in range(lenth - 3):
if x[i].islower() == True: #这里找出str1中的小写字母
if (x[(i - 3):i].isupper() == True) and (x[(i + 1):(i + 4)].isupper == True): #这里试图筛选出两边有3个大写字母的小写字母(似乎?问题出在了这里?)
if x[i - 4].isupper() == False and x[i + 4].isupper() == False: #这里剔除掉不仅仅只有3个大写字母的情况
list1.append(x[i])
continue
return list1
print(count(str1))
我百思不得其解 为什么我最后的list1是一个空列表
下面是str1
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本帖最后由 isdkz 于 2022-3-13 13:20 编辑
因为小甲鱼的字符串跟你的不一样,你的粘贴上来的是带 换行 的,
>>> 'AB\n'.isupper() # 可以看到带着换行符也是会被判断为 True 的,你的字符串虽然没有 \n,但是三引号就是会把你换行的地方自动转为 换行符 \n
True
>>>
小甲鱼的没有换行,是连着的。
你的字符串用 replace 方法把换行去掉就跟小甲鱼的一样了,
replace用法:
- str1.replace('\n', '') # 替换掉字符串中的换行符为空字符,即去掉换行符
复制代码
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