Python 3.x 学习：Python 基础代码(二)

#!/usr/bin/env python3# -*- coding: utf-8 -*-#Robin HU的python的代码，以下是基本的数据类型操作。#python 中含有5种数据类型：#数字，字符串，列表，元组，字典。       #数字可分：int 带符号整型，float 浮点型，complex 复数。       #string 字符串可用‘a’，“a”，“”a“”，“”“a”“”，取元素用C语言中的[index]操作，可用+连接2个字符串，[-1]=!(字符串结束符)       #list 列表,用[]括起，中间用“，”分开：['aaa',1,-1],引用[index]，可用+连接2个列表，[-1]表示最后一个元素       #tuple 元组用（）括起，中间用“，”分隔，其元素不可写，类似只读列表，操作用[]，元组可用+连接，[-1]表示最后一个元素       #字典用{}括起，中间用“，”分隔，使用[]分配和访问值，字典是一种哈希表，由键值对组成，字典键可以是python任何数据类型/对象#list 成员函数：加到最后append(item)，insert(index,item),删除末尾一个pop()，或pop(index)删除固定位置#     list可以含有List,firstNum =4;negnum  = -2;complex = 1+2j;string = 'jj';floataa = 1.0;String = '01234567'; # string can be grouped by ' or ""site = "www.google.com"; # string can be grouped by ' or ""list = ['string',1,1.0,-3,3+5j];###################basic variables########print(firstNum);print(negnum);print(string);print(floataa);print(complex*complex);print(String);print(site);print('String[0]:',String[0]);print('String[1:]:',String[1:]);print('String[-1]:',String[-1]);###################list####################print('list=',list);print('list[0]=',list[0]);print('list[1:]=',list[1:]);print('list[-1]:',list[-1]);print ('list[-3:-1] = ',list[-3:-1]);print ('list[-1:1] = ',list[-1:1]);print ('list[-1:0] = ',list[-1:0]);tuple = ( 'maxsu', 786 , 2.23, 'yiibai', 70.2  )tinytuple = (999.0, 'maxsu')# tuple[1] = 'new item value' 不能这样赋值print ('tuple = ', tuple)           # Prints complete tupleprint ('tuple[0] = ', tuple[0])        # Prints first element of the tupleprint ('tuple[1:3] = ', tuple[1:3])      # Prints elements starting from 2nd till 3rd print ('tuple[-3:-1] = ', tuple[-3:-1])       # 输出结果是什么？print ('tuple[2:] = ', tuple[2:])       # Prints elements starting from 3rd elementprint ('tinytuple * 2 = ',tinytuple * 2)   # Prints tuple two timesprint ('tuple + tinytuple = ', tuple + tinytuple) # Prints concatenated tupleprint('=================first test==============');s1,s2=72,85;rate = (s2-s1)/s1;print('%.1f' % rate);L = [    ['you', 'Google', 'Microsoft'],    ['Java', 'are', 'Ruby', 'PHP'],    ['Adam', 'Bart', 'beautiful!']]print(L[0][0]);print(L[1][1]);print(L[-1][-1]);print('=================second test==============');##############以下是python条件分支代码#############age = input('please inut your age: ');if (((int(age))<18)&((int(age))>10)):    print('you are teenager');elif (int(age))<10:    print('you are kid');else:    print('you are adult');###################################################name   = input('please input your name: ');height = float(input('please input your height: '))weight = float(input('please input your weight: '));bmi = ((height)/(weight**2))*100;print(bmi);###################################################dic = {}dic['one'] = "one"dic[2]     = "two"tinydic = {'name': 'Robin', 'code' : 1458, 'dept':'R&D'}print ("dict['one'] = ", dic['one'])       # Prints value for 'one' keyprint ('dict[2] = ', dic[2])           # Prints value for 2 keyprint ('tinydict = ', tinydic)          # Prints complete dictionaryprint ('tinydict.keys() = ', tinydic.keys())   # Prints all the keysprint ('tinydict.values() = ', tinydic.values()) # Prints all the values