#!/usr/bin/env python

# -*- coding:utf8 -*-

#布尔值

v = 1==1

print (v)

a = 1 != 2

print (a)

"""

先计算括号内 ****

True OR  ==> True

True AND ==> 继续走

False OR ==> 继续走

False AND==> False

"""

user = "alex"

pwd = ""

v = user == 'alex' and (pwd == "" or 1 == 1) and pwd == ""

print(v)

#算数运算=赋值运算

count = 0

number = 0

count = count + 1

number += 1

print (count==number)

#结果是真实值

#算数运算

a = 10 * 10

print(a)

#赋值运算

b = 0

b = b + 1

b  += 1

print(b)

#结果是布尔值

#比较运算

c = 1 > 5

c

print(c)

#逻辑运算

d = 1>6 or 1 == 1

print(d)

#成员运算

e = "啊" in "阿坤"

print(e)

#基本数据类型

#数字

num = 123

v=num.bit_length()

print(v)

#字符串

name = "csdnak"

v1 = name.upper()

print(v1)

"""

整形int

Python3里，31415926159261592615...(无限)

Python2里，1234567890（有范围）

长整型long

Python2里,31415926159261592615...

"""

#数字魔法在int里,ctrl+鼠标左键点击int

a = 404

b = a.bit_length()

print(b)

#type()照妖镜，可查看所属类型

c = ""

print(type(c),c)

d = int(c)

d =  d + 321

print(type(d),d)

#进制转换2,8,16进制等

num = "a"

v = int(num,base=16)

print(v)

#当前数字的二进制至少用n位表示

age = 10

r = age.bit_length()

print(r)

#字符串str里,ctrl+鼠标左键点击str.

s1 = "csdnak"

a = s1.upper()

b = s1.title()

c = s1.startswith('cs')

print(a,b,c)

#首字母大写

v = s1.capitalize()

print(v)

#所有变小写，casefold更牛逼，很多未知的对象应变小写

v1 = s1.casefold()

print(v1)

#跟casefold功能一样,但是只能使常规字符变小写

v2 = s1.lower()

print(v2)

#20代表总长度并且字符居中

#*号为填充符号可有可无,也可以是其他任何字符但只限1位

v3 = s1.center(20,"*")

print(v3)

#在s1中包含几个c

#2为起始位置，5为结束位置，二者可有可无

v4 = s1.count('c',2,5)

print(v4)

#以什么什么结尾

#以什么什么开始 返回bool布尔值

v5 = s1.endswith('dn')

v6 = s1.startswith('c')

print(v5,v6)

#从开始往后找，找到第一个之后，获取其位置

#> 或>=,支持区间(例：大于等于9小于12)找不到输出为-1

test = "csdngithubak"

v7 = test.find('bak',9,12)

print(v7)

#格式化,将一个字符串中的占位符替换为指定的值

#如果对象为数字则从左往右按顺序来替换(第一位为0)

t = 'i am {name},age {num}\n'

t1 = 'i am {0},age {1}\n'

v8 = t.format(name='wxk',num=19)

v9 = t1.format('wxk',19)

#基于字典格式化,传入的值{"name":'wxk',"num":19}

v10 = t.format_map({"name":'wxk',"num":19})

print(v8,v9,v10)

#index找不到就会报错，所以一般都用find

v11 = test.index('')

print(v11)

#字符串中是否只包含 字母或数字,若不是则返回False

#也可以纯数字和字母

t2 = "csdnak187"

v12 = t2.isalnum()

print(v12)

"""

#列表list里，ctrl+鼠标左键点击list.

...

#元祖 tuple里，ctrl+鼠标左键点击tuple.

...

#字典 dict里，ctrl+鼠标左键点击dict.

...

#布尔值bool里,ctrl+鼠标左键点击bool.

...

"""