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1. 请用已学过的知识编写程序,找出小甲鱼藏在下边这个长字符串中的密码,密码的埋藏点符合以下规律:
a) 每位密码为单个小写字母
b) 每位密码的左右两边均有且只有三个大写字母
str1 = """ACFlCTLIQlAIVMTqHFkswqbDDHtpgcWaXSSglUYKElqNsYCyaQXBzrFUbkAUAWAKrDgDtAlGMBqWQhpEwquZqWZJpslUfMllCwWptqINjrOBTLuPzwvXNbLCx
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qKWGc"""
我写了两个第一种把str换成list了,结果第一种是ilovefishc,第二种是uilovefisdhc,哪里不一样呢。。。
如果是没算空格的话输出结果应该也一样啊。。
第一种:
num = 3
list1 = list(str1)
for each in list1:
if str(list1[num]).islower() and\
str(list1[(num - 3):(num)]).isupper() and\
str(list1[(num + 1):(num + 4)]).isupper() and\
str(list1[num-4]).islower() and\
str(list1[num+4]).islower():
print(str(list1[num]),end = '')
num += 1
if num ==len(list1)-3:
break
第二种:
num = 3
for each in str1:
if str1[num].islower() and\
str1[(num - 3):(num)].isupper() and\
str1[(num + 1):(num + 4)].isupper() and\
str1[num - 4].islower() and\
str1[num + 4].islower():
print(str1[num],end = '')
num += 1
if num ==len(str1)-3:
break
- iD S K J K L
- lT J N H Z Y
- oS K L I O S
- vT U P O C P
- eI E K G G G
- fH I R D B Y
- iB G T A B T
- sI O K D P O
- hJ F F C S V
- cN T L A E I
复制代码
这是第一个找出密码的前三位和后三位
- uI Y
- A B N
- iD S K J K L
- lT J N H Z Y
- oS K L I O S
- vT U P O C P
- eI E K G G G
- fH I R D B Y
- iB G T A B T
- sI O K D P O
- d
- W F Z N R
- hJ F F C S V
- cN T L A E I
复制代码
这是第二个,可以发现比第一个多出的'u'和'd'算入了'\n',我们来看个例子:
- >>> "['B', 'C', '\\n']".isupper()
- False
复制代码
'\\n'并不会被当做大写,在第一个程序str(list())语句中,原有字符串中的'\n'会被转化为'\\n':
- >>> list1 = ['A','B','C','\n']
- >>> str(list1[1:4])
- "['B', 'C', '\\n']"
复制代码
而这会被isupper方法判定为假。
再来看第二个:
- >>> str1 = 'ABC\n'
- >>> str1[1:4].isupper()
- True
- >>> str1[1:4]
- 'BC\n'
- >>>
复制代码
字符串中即使带有'\n',因为被转义了,所以会被忽略,只要其他字符是大写,isupper就会判定为真
但要注意,单个的'\n'不会被当做大写:
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