Python编程从入门到实践（1）学习笔记

图灵程序设计丛书

Python编程从入门到实践

人民邮电出版社

以代码的形式，来学习python

本文是在window平台 安装的python3.8，开发工具用的Pycharm

第一章，第二章

#!/usr/bin/env python3
#上面一行可以在linux环境直接运行，win平台不行
# $ chmod a+x hello.py

100+ 200
100 + 200 + 300
print('hello world!')
print(100 + 200 + 300)
# 次方Power(2,10)
print(2**10)

# 拼接打印字符串
print('The quick brown fox', 'jumps over', 'the lazy dog')

print('100 + 200 =', 100 + 200)

name = "test"
#name = input()
print(name)

#这里是注释
#name = input('please enter your name: ')
print('hello,', name)

# class Data Test:
a = 'a'
print(a)

#字符串混排 转义
message = "i'm zc"
message = 'i"m zc call me "hello,world"'
message = "i'm zc call me \"zc\""
print(message)
message = "i\'m zc call me \"zc\""
print(message)

s1 = "ada"
print(s1.title())
s1 = "ADA"
print(s1.title())
print("变小写：", s1.title().lower())

#字符串拼接
first = "zhang"
last  = "san"
print(first + " " + last)

#换行 指标位
print("zc:\nsecond line \taaa\nthird line")

#去除空格
s2 ="  aaaa  "
print(s2.rstrip())
print(s2.lstrip())
print(s2.strip())

#0.30000000000000004
print(0.2 + 0.1)
print(3*0.1)

#浮点 python2 3/2=1  3.0/2=1.5
print(3/2)
print(3.0/2)

#指导原则
import this