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python 日常练习

解压序赋值给多个变量

现有一个包含N个元素的元组或者是序列，将它里面的值解压后同时赋值给N个变量

In [22]: p = (1,2)
In [23]: a,b = p
In [24]: a
Out[24]: 1
In [25]: b
Out[25]: 2


In [26]: date = ['test','frum','bind','lance',(201,202,203)]
In [27]: te,fr,bi,la,data = date
In [28]: te
Out[28]: 'test'
In [29]: fr
Out[29]: 'frum'
In [30]: bi
Out[30]: 'bind'
In [31]: date
Out[31]: ['test', 'frum', 'bind', 'lance', (201, 202, 203)]
In [32]: data
Out[32]: (201, 202, 203)


In [41]: a = 'Hello'
In [42]: b,c,d,e,f = a
In [43]: b
Out[43]: 'H'
In [44]: c
Out[44]: 'e'
In [45]: d
Out[45]: 'l'
In [46]: f
Out[46]: 'o'

初级练习题

给一个半径，求圆的面积和周长。圆周率3.14

from math import pi
r=int(input('r='))
print('area='+str(pi*r*r))
print('circumference='+str(2*pi*r))

(py3_env) kernel ➤ python test.py                                                                                                                                                               
r=10
area=314.1592653589793
circumference=62.83185307179586

输入两个数，比较大小后，从小到大升序打印

a = input('first: ')
b = input('second: ')

if a > b:
    print(b,a)
else:
    print(a,b)

(py3_env) kernel ➤ python test.py                                                                                                                                                               
first: 10
second: 11
10 11

输入n个数，求每次输入后的算数平均数

n = 0
sum = 0

while True:
    i = input(">>>")
    if i == 'quit':
        break

    n += 1
    sum += int(i)
    avg = sum/n
    print(avg)

打印九九乘法表

for i in range(1,10):
    for j in range(1,i+1):
        print(str(j)+'x'+ str(i) +"=" +str(i*j),end=' ')


for i in range(1,10):
    for j in range(1,i+1):
        product = i*j

        if j > 1 and product <10:
            product = str(product) + ' '
        else:
            product = str(product)
        print(str(j)+'x'+str(i)+"="+str(product),end=' ')
    print()

打印菱形

for i in range(-3,4):
    if i<0:
        prespace = -i
    else:
        prespace = i

    print(' '*prespace + '*'*(7-prespace*2))

斐波那契数列，100以内

斐波那契数列:1,1,2,3,5,8,13,21,34,55,89,144,...
a = 0
b = 1

while True:
    c = a+b
    if c > 100: break
    a=b
    b=c
    print(c)

a = 1
b = 1
index = 2
print('{0},{1}'.format(0,0))
print('{0},{1}'.format(1,1))
print('{0},{1}'.format(2,1))

while True:
    c = a + b
    a = b
    b = c
    index +=1
    print('{0},{1}'.format(index,c))

    if index == 101:
        break

pip 简单使用

# 配置国内的源
~ ➤ cat ~/.pip/pip.conf
[global]
index-url=http://mirrors.aliyun.com/pypi/simple
trusted-host=mirrors.aliyun.com
# pip 常用命令
# pip install xxx yyy
# pip list 
# pip search keyword 或者 pypi
# pip help install 
# pip install jupyter 
# pip -V 
# pip freeze > requirement
# pip install -r requirement
# virtualenv  ~/Desktop/MyPython/py3_env --python=python3

猜数字的游戏

NUM = 35

count = 0

while count < 3:
    user_input = int(input('请你输入一个数字: '))
    if user_input == NUM :
        print('你猜对了')
        break
    elif user_input < NUM:
        print('你输入的数比这个数要小')
    else:
        print('你输入的数比这个要大')
    count +=1
else:
    print('你已经超过了三次机会')

不用变量时，把变量放空

for _ in range(0,3):
    user_input = int(input('请你输入一个数字: '))
    if user_input == NUM :
        print('你猜对了')
        break
    elif user_input < NUM:
        print('你输入的数比这个数要小')
    else:
        print('你输入的数比这个要大')
    count +=1
else:
    print('你已经超过了三次机会')

打印扬辉三角

python 中求阶乘的方法

import math 
math.factorial(5) # 5 的阶乘 

import math

lines = 10

for n in range(0,lines):
    if n == 0:
        for _ in range(0, lines // 2):
            print(' ',end=' ')
        print(1)
    else:
        for _ in range(0,lines //2):
            print(' ',end=' ')

        for m in range(0, n+1):
            num = math.factorial(n) //(math.factorial(m) * math.factorial(n-m))
            print(num, end=' ')
        print()

host = {"host%d"%i: "192.168.1.%d"%i for i in range(2,11)}
for i in host.values():
    print (i)

lst = list(range(1,101))
lst[0::2] [::-1]
lst[1::2] [::-1]

python 与用户交互输入位数生成若干随机数，求若干随机数的最大值，最小值

#!/usr/bin/env python3
from fabric.colors import red,blue,green,cyan
import random


a=int(input(red('您要获取多少个随机数: ')))
b=int(input(red('您要获取的随机数位数: '))) + 1

num_two = []
for i in range(int(a)):
    num = random.randrange(0,b)
    print(cyan('第') + blue(i + 1) + cyan('个随机数为'),blue(num))
    num_two.append(num)
print(cyan('您获取了') + blue(i + 1) + cyan('个随机数'))
print(cyan('您的第') + blue(num_two.index(max(num_two)) +1 ) + cyan('个随机数为最大值:'), green(max(num_two)))
print(cyan('您的第') + blue(num_two.index(min(num_two)) +1 ) + cyan('个随机数为最小值:'), green(min(num_two)))

方法二

#!/usr/bin/env python3
# -*- coding: utf-8 -*-
from fabric.colors import red,blue,green,cyan
import random
a=int(input(red('您要获取多少个随机数: ')))
b=int(input(red('您要獲取的隨機數範圍: '))) + 1
range_init = list(range(1,int(a)+1))
print (range_init)
num_two = []
for i in range_init:
    num = random.randrange(0,b)
    num = random.randrange(0,b)

    print(cyan('第') + blue(i) + cyan('个随机数为'),blue(num))
    num_two.append(num)
print(cyan('您获取了') + blue(i) + cyan('个随机数'))
print(cyan('您的第') + blue(num_two.index(max(num_two))+1) + cyan('个随机数为最大值:'), green(max(num_two)))
print(cyan('您的第') + blue(num_two.index(min(num_two))+1) + cyan('个随机数为最小值:'), green(min(num_two)))