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# -*- coding: utf-8 -*-
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"""
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Created on Mon Oct 25 22:08:21 2021
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@author: Administrator
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"""
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import numpy as np
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#科学计数法
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print(4.3e-3)#表示4.3*10**-3次方
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#不想采用科学计数法
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np.set_printoptions(suppress=True)
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#format()函数
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name="xiaoming"#字符串的格式化,会产生新的字符串
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age=18
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favourite=666
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print(f"name is:{name},aged{age}")
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#^居中填充，<左对齐填充，>右对齐填充
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print(f"name is:{name},I like{favourite:*<8}")#:后面表示填充的字符，不指定默认空格+对齐方式+用填充几位
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#数字格式化
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#{:.2f}保留2位小数
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#{:.2e}以科学计数法形式输出
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#{:.2%}以百分号形式输出
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print("{:0<10d}".format(3))#{:0<10d}用0填充10位，左对齐
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a,b=1.234567,0.00321
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print("{0:.3f}".format(a))#这样可以同时输出多个，0，1，2....表示参数序号
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print("a="+format(a,".3f")+",b="+format(b,".2e"))#format()为str类型
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print(type(format(a,".3f")))#str类型
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#变量名不可以数字起头
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#只包含字母，数字和下划线
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a,b=5,2
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a,b=b,a#在这里是同时执行的，a=b=2，此时b=a仍应该将a视为原来的5，故b=2
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print(a,b)#输出2，5
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a,b=5,2
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a=b
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b=a
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print(a,b)#输出2，2
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print(0.53+0.3)#输出结果不是0.83哦，试试吧
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print(format(0.53+0.3,".2f"))
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from decimal import *
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print(Decimal("0.53")+Decimal("0.3"))
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msg="www.BaiDu.com"
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print(msg.upper())#全大写
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print(msg.lower())#全小写
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print(msg.capitalize())#首字母大写，其他小写
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print(msg.title())#每个单词首字母大写，其他小写
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x=input().split(",")#python列表中字符串转数字
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print(x)
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lst1=list(map(eval,x))#返回map对象，在转换成列表
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print(lst1)
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#按指定符号分隔一个列表
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lst1=[1,2,3,4,5,6]
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str1="*".join(str(n) for n in lst1)#"sep（自己指定的分隔符）".join(字符串元素形成的列表，字典，元组等)，转完之后是字符串
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print(str1)
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print(str1="sss")#不能这么用，要分开写
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str1="sss"
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print(str1)
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#decimal库
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n1=1.1
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n2=2.2
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from decimal import *#Decimal(“”)用于保持
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print(Decimal(n1)+Decimal(n2))
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print(Decimal("1.1")+Decimal("2.2"))
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msg="www.BaiDu.com"
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print(msg.upper())#全大写
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print(msg.lower())#全小写
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print(msg.capitalize())#首字母大写，其他小写
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print(msg.title())#每个单词首字母大写，其他小写
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#对字符串进行sorted方法
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str1="hello world"
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print(sorted(str1))#“ ”>字母表排序
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print(type(sorted(str1)))#list类型
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from random import *#调用随机数模块
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computer=randint(1, 3)
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player=eval(input("1==剪刀，2==石头，3==布"))
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print(computer)
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if player==computer:
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print("平局")
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elif (player==1 and computer==2) or (player==2 and computer==3) or (player==3 and computer==1):
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print("玩家失败")
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else:
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print("玩家胜利")
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def isprime(a):#判断是否为素数
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global c#指明为全局变量
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if a==2:
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c=1
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for b in range(2,a):
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if a%b==0:#非素数
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c=0
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break
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else:#素数
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c=1
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return c
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def gcp(a,b):#辗转相除求最大公约数
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while b%a!=0:
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a,b=b%a,a
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return a
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a,b=eval(input())
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c=gcp(a,b)
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d=c*(a/c)*(b/c)
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print("最大公约数：%d"% c)
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print("最小公倍数：%d"% d)
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x=4
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if 2:#True
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print(5)
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else:
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print(6)
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#lst.pop([i])
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#方法签名中i两边的方括号表示这个参数是可选的，而不是要你输入方括号。你会在 Python 参考库中经常看到这种表示方法
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nameList=eval(input())#可以直接转换成列表
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print(nameList)
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print(type(nameList))
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lst1=[1,2,3,4,3,5,7,8]
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x=len(lst1)#x=48
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print(x/2)#4.0浮点数
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print(x//2)#4整数,int才可以作为列表的索引
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