day11

day11

8.28 小练习

1 统计输入的字符多少个

>>> strs = str(input('pelase input str'))

pelase input strtiyiyubhnljikmltuyohij;451515

>>> num = 0

>>> for i in strs:

... num +=1

>>> num

29

  2 统计输入的字符多少个字母和数字

import string

str_leeters = string.ascii_letters

number = 0

str_num = 0

strs = str(input('pelase input str'))

for i in strs:

if i in str_letters:

str_num += 1

elif i in '0123456789':

num += 1

else:

print('error')

  3 将字符串中的数字去掉，只保留字母

s = 'fdsaf44523fgj23j3kj23'

strs = ''

for i in s:

if i not in '0123456789':

ss = i

strs = ss

  4 输入3个学生成绩，求和、平均数和最好成绩

n1 = int(input('please input sore'))

n2 = int(input('please input sore'))

n3 = int(input('please input sore'))

add = n1+n2+n3

avg =(n1+n2+n3)/3

n = []

n.append(n1)

n.append(n2)

n.append(n3)

good = n[0]

for i in n:

if i > good:

good = i

  5 输入一个学生成绩，判断是优良中及格和不及格

sore = int(input('please input sore'))

if sore < 60:

print("不及格")

elif sore >=60 and sore <80:

print("及格")

elif sore >=80 and sore <=100:

print("优良")

else:

print("你输入的是啥？")

  6 生成3个随机字母的字符串，生成一个随机小数的字符串 2个整数位和2个小数位

import string,random

str_leeters = string.ascii_letters

strs = ''

for i in range(3):

s = random.choice(str_letters)

strs += s

 

  7 统计一个数字中包含奇数数字的个数

num = 2524351412798

count = 0

for i in num:

if i % 2 ==1:

count += 1

  8 将数字的每一位+2，转换成一个新数字。（整数和小数）

整数

num = 32412

new_num = ''

for i in str(num):

n = int(i) +2

new_num += str(n)

int(new_num)

小数

num = 514.3412

new_num = ''

for i in str(num):

if i != '.':

n = int(i) +2

new_num += str(n)

int(new_num)

 

  9 将每个小写字母转换为大写字母，大写字母转换为小写字母

s =" AaBbCcDdEd"

ss = ''

import string

string_lowercase = string.ascii.lowercase

string_uppercase = string.ascii_uppercase

for i in s:

if i in string_lowercase:

s = chr(ord(i)-32) # s = i.upper()

ss += s

elif i in string_uppercase:

s = chr(order(i)+32) # s = i.lower()

ss += s

else:

print("请检查输入是否是字母")

 

  10 将一个bytes类型的gbk字符串，转为utf-8编码的bytes字符串

(用什么编码的就要用什么解码，然后再编码成想要的类型，gbk编码的就要先用gbk解码，再转utf-8)

>>> a = "中国"

>>> a.encode('gbk')

b = b'\xd6\xd0\xb9\xfa'

b.decode('gbk').encode('utf-8')