自学python 3.

1.name = "aleX leNb"
    1.a = name.strip()
    print(a)
    2.a = name.lstrip('al')
    print(a)
    3.a = name.rstrip('Nb')
    print(a)
    4.a = name.lstrip('a')
    b = a.rstrip("b")
    print(b)
    5.print(name.startswith('al'))
    6.print(name.endswith('Nb'))
    7.a = name.replace('l','p')
    print(a)
    8.a = name.replace('l','p',1)
    print(a)
    9.a = name.split('l')
    print(a)
    10.a = name.split('l',1)
    print(a)
    11.a = name.upper()
    print(a)
    12.a = name.lower()
    print(a)
    13.(1)s1 = name[:1]
    s2 = name[1:]
    print(s1.upper() + s2)
    (2)name.replace('a','A',1)
    14.count = name.count('l')
    print(count)
    15.s1 = name[:4]
    s2 = s1.count('l')
    print(s2)
    16.s1 = name.index('N')
    print(s1)
    17.s1 = name.find('N')
    print(s1)
    18.s1 = name.find('X le')
    print(s1)
    19.s1 = name[2]
    print(s1)
    20.s1 = name[:3]
    print(s1)
    21.s1 = name[-2:]
    print(s1)
    22.count = 0
    while count < len(name):
        if name[count] == 'e':
            print(count)
        count += 1

2.s = "123a4b5c"
    1.s1 = s[:3]
    print(s1)
    2.s1 = s[3:6]
    print(s1)
    3.s1 = s[::2]
    print(s1)
    4.s1 = s[1:6:2]
    print(s1)
    5.s1 = s[-1]
    print(s1)
    6.s1 = s[-3:-8:-2]
    print(s1)

3.count = 0
while count < len(s):
    print(s[count])
    count += 1

for a in s:
    print(a)

4.for c in s:
    print(s)

5.for a in s:
    print(a + 'sb')

6.for a in s:
    print('倒计时' + a + '秒') #print('倒计时%c秒'% a)
else:
    print('出发!')

7.两数相加:
num = input("请输入算式:")
s = num.split('+')
s1 = int(s[0])
s2 = int(s[1])
print(s1 + s2)

8.多数相加:
num = input("请输入算式:")
s = num.split('+')
count = 0
a = 0
while count < len(s):
    a = a + int(s[count])
    count += 1
print(a)

9.内容中几个整数:
(1)num = input("请输入内容:")
count = 0
a = 0
while count < len(num):
    if num[count].isdigit():
        a += 1
    count +=1
print(a)

(2)num = input("请输入内容:")
count = 0
for a in num:
    if a.isdigit():
        count += 1
print(count)

10.回家方式:
while 1:
    num = input("请输入ABC:").strip().upper()
    if num == 'A':
        print('走大路回家')
        num2 = input('公交车还是步行?')
        if num2 == '公交车':
            print('10分钟到家.')
            break
        else:
            print('20分钟到家.')
            break
    if num == 'B':
        print('走小路回家.')
        break
    if num == 'C':
        print('绕道回家.')
        num3 = input("游戏厅还是网吧?")
        if num3 == "游戏厅":
            print('一个半小时到家,挨打,重新输入:')
        else:
            print('两小时到家,挨打,重新输入:')

11.1-2+3-4...+99:
(1)a = 1
b = 2
s1 = 0
s2 = 0
while a < 100:
    s1 = s1 + a
    a += 2
while b < 99:
    s2 = s2 + b
    b += 2
print(s1-s2+88)

(2)a = 1
s = 0
while a < 100:
    if a%2 == 0:
        s = s - a
    else:
        s = s + a
    a +=1
print(s+88)

12.回文:
s = input('输入一句话:')
s1 = s[::-1]
if s == s1:
    print('是')
else:
    print('否')

13.一句话各种字符的个数:
s = input('输入一句话:')
daxie = 0
xiaoxie = 0
shuzi = 0
other = 0
for c in s:
    if c.isdigit():
        shuzi +=1
    elif c.isupper():
        daxie +=1
    elif c.islower():
        xiaoxie +=1
    else:
        other +=1
print(daxie,xiaoxie,shuzi,other)

14.格式化输出;
a1 = input('请输入姓名:')
a2 = input('请输入地点:')
a3 = input('请输入爱好:')
print('可爱的{a1}喜欢在{a2}{a3}'.format( a1 = a1 ,a2 = a2 , a3=a3))

15.姓氏是否在百家姓:
s = input('请输入姓名:')
s1 = ''
bjx = '赵钱孙李周吴郑王'
for c in s:
    s1 = s1 + c
    if s1 in bjx:
        print('是')
        break
    else:
        print('否')
        break

16.
s = input('请输入内容:')
a = 0
while a < len(s):
    print(s[a])
    a += 1

s = input('请输入内容:')
for c in s :
    print(c)