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| ''''''
import random
'''
初级：
1.已知字符串：“this is a test of Python”
a.统计该字符串中字母s出现的次数
b.取出子字符串“test” 提示: str.find('test')
c.采用不同的方式将字符串倒序输出
d.将其中的"test"替换为"exam" str.replace()
'''
s = "this is a test of Python"
count = 0
for c in s:
if c == 's':
count += 1
print(count)
s = "this is a test of Python"
start = s.find('test')
end = start + len('test')
print( s[start:end] )
s = "this is a test of Python"
print(s[::-1])
s2 = ""
for i in range(len(s)-1, -1, -1):
s2 += s[i]
print(s2)
s3 = ""
for c in s:
s3 = c + s3
print(s3)
s = "this is a test of Python"
s2 = "exam"
s3 = s.replace('test', s2)
print(s)
print(s3)
'''
2.已知字符串 a = "aAsmr3idd4bgs7Dlsf9eAF",要求如下
a.请将a字符串的大写改为小写，小写改为大写 ch.lower()小写， ch.upper()大写
b.请将a字符串的数字取出，并输出成一个新的字符串 ch>='0' and ch<='9'
c.请统计a字符串出现的每个字母的出现次数（忽略大小写，a与A是同一个字母），
并输出成一个字典。 例 {'a':4,'b':2}
d.输出a字符串出现频率最高的字母
e.请判断'boy'里出现的每一个字母，是否都出现在a字符串里。
如果出现，则输出True，否则，则输 出False
'''
a = "aAsmr3idd4bgs7Dlsf9eAF"
a2 = ""
for c in a:
if c>='a' and c<='z':
a2 += c.upper()
elif c>='A' and c<='Z':
a2 += c.lower()
else:
a2 += c
print(a2)
a = "aAsmr3idd4bgs7Dlsf9eAF"
a3 = ""
for c in a:
if c>='0' and c<='9':
a3 += c
print(a3)
a = "aAsmr3idd4bgs7Dlsf9eAF"
d = {}
for c in a:
if c>='a' and c<='z' or c>='A' and c<='Z':
c2 = c.lower()
if c2 not in d:
d[c2] = 1
else:
d[c2] += 1
print(d)
l = list(d.values())
max_count = max(l)
for k,v in d.items():
if v == max_count:
print(k, end=', ')
print()
a = "aAsmr3idd4bgs7Dlsf9eAF"
for c in "boy":
if c not in a:
print(False)
break
else:
print(True)
'''
注：能不使用系统功能的尽量不要使用，自己实现
中级
1.去除字符串两端的指定字符.
s = "hello"
ch = "h"
# ello
'''
s = "hhhhhelhhlohhhhhh"
ch = 'h'
i = 0
while i < len(s):
if s[i] == ch:
s = s[1:]
i -= 1
else:
break
i += 1
print(s)
i = len(s) - 1
while i >= 0:
if s[i] == ch:
s = s[:-1]
else:
break
i -= 1
print(s)
'''
2.键盘输入一句英文 将每个单词的首字母大写
例如:
输入: hello nice to meet you
转化之后: Hello Nice To Meet You
'''
s = "hello nice to meet you"
s2 = ""
for i in range(len(s)):
if i==0 or s[i-1]==" ":
s2 += s[i].upper()
else:
s2 += s[i]
print(s2)
'''
3.输入一个字符串，压缩字符串如下aabbbccccd变成a2b3c4d1
'''
s = "aabbbccccd"
d = {}
for c in s:
if c not in d:
d[c] = 1
else:
d[c] += 1
print(d)
s2 = ""
for k, v in d.items():
s2 = s2 + k + str(v)
print(s2)
'''
4.完成猜拳游戏
-----------------------------
请输入你的选择:
1. 石头
2. 剪刀
3. 布
-----------------------------
你的选择是【布】, 电脑的选择是【石头】
恭喜你获得了胜利！
'''
print('''-----------------------------
请输入你的选择:
1. 石头
2. 剪刀
3. 布
-----------------------------''')
while True:
me = int(input("请出拳(输入编号):"))
computer = random.randint(1,3)
print(me, computer)
if me-computer == -1 or me-computer == 2:
print("恭喜你获得胜利!")
break
elif me == computer:
print("平手")
else:
print("我输了")
|
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