一个专注于计算机编程和硬件学习的博客主
字典迭代names = {'Mary Wang': 'She is very cute', 'William Liu': 'He is very handsome', 'Tom Zhao': 'He is a little bit shy', 'Jary Qian': 'He is very rich'} for key, value in names.items(): print('Name:{} Saying:{}'.format(key, value))Name:Mary Wang Saying:She is very cute Name:William Liu Saying:He is very handsome Name:Tom Zhao Saying:He is a little bit shy Name
控制流if语句if 判断条件：game = 1000 money = 100000 if game<2000: game+=1000 money-=1000 print('You have '+str(game)+'RMB in your game,' + 'you have '+str(money)+'RMB in your money!')You have 2000RMB in your game,you have 99000RMB in your money!if 、else 、elifpeople='Tom' if people=='Mary': print('Hello Mary!') elif people=='Tom': print('Hello,Tom~') else: print('Go away~')Hello,Tom~fo
字典结构--字典名={字:解释,…}查字典--print(字典名[字])>>> names={'Tom':'Tom is very tall','William':'William is very handsome'} >>> names {'Tom': 'Tom is very tall', 'William': 'William is very handsome'} >>> print(names['Tom']) Tom is very tall也可用.get()查>>> names {'Tom': 'Tom is very tall', 'William': 'William is very handsome'} >>> print(n
元组和元组解包tuple元组名=( , )>>> place=(1,2) >>> print('Longitude:',place[0]) Longitude: 1 >>> print('Latitude:',place[1]) Latitude: 2元组解包--批量数据批量赋值>>> dimensions=1,2,3 >>> length,width,hight=dimensions >>> length 1 >>> width 2 >>> hight 3 >>> length,width,hight=dimensions >>>print('The dimensions are'+str(length)+'*'+str(width)+'*'+str(hight)) The dimensions are1*2
列表切片显示列表的范围：数组[n:m]--（数组(n)~数组(m-1)）左包右不包冒号前面没有标表示从头开始冒号后面没有标表示到结尾>>> A=[1,2,3,4,5,6] >>> A[1:3] [2, 3] >>> A[0:6] [1, 2, 3, 4, 5, 6]判断元素是否在列表in 在列表: 在 返回 true,不在 返回 falsenot in 不在列表: 在 返回 false, 不在 返回 true字符串是不可变,列表是可变的>>> a=['A','C','D','B'] >>> b=a >>> a[0]='B' >>> a ['B', 'C', 'D', 'B'] >>> b ['B', 'C', 'D&#
算数运算符“+”、“-”、“*”、“/”、“%”、“**(幂运算)”变量和赋值运算符a=1整数、浮点数利用type（）检测 print（type（））在python中浮点数要比实际的值大一点比如0.1不是真实的等于0.1，只是非常接近于0.10.1+0.1+0.1=0.300000000000000040.2+0.2+0.2=0.6000000000000001比较运算符<、 >、 ==、 <=、 >=、 !=逻辑运算符and、or、not字符串字符串可以用“双引号”和‘单引号’框起来当字符串使用单引号框起来后里面存在单引号时，可在单引号前面加上`` 提示Im learning python "Im learning python"字符串可以进行加法>>> First_word='Hello ' >>> Second_word='world!' >>> print(First_word + Second_word) Hello world!字
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