内置函数

print(all([1,2,3,4]))#True 都为真才为真
print(all([1,2,3,0]))#False
print(all([1,2,3,False]))#False

print(any([1,2,3,4]))#True 都为False才为假
print(any([0,0,0,0]))#False

print(max([1,2,5,2]))
print(min([1,2,5,2]))

print(round(2.3455,2))#2.35 取小数点后固定位数，会四舍五入

a=‘1‘
print(dir(a))#可以调用的函数

print(bin(10))#0b1010  10进制转2进制
print(bin(2))# 10进制转2进制

print(chr(98))#b  ascii 转字符
print(ord(‘a‘))#97  字符转ascii

print(hex(11))#数字换16进制  0xb
print(oct(11))#数字换8进制  0o13

s = ‘‘‘
for i in range(10):
    print(i)
‘‘‘
exec(s)#动态执行python代码
# res = eval(‘1+1‘)#执行简单代码
res = eval(‘[1,2,3]‘)#执行简单代码
print(res)

# filter()#过滤
# map()

def jishu(num):
    if num%2==0:
        return True
l=range(1,11)

l2=[]
for i in l:
    if jishu(i):
        l2.append(i)
# print(l2)

#自动循环，与上面功能相同
result = list(filter(jishu,l))#[2, 4, 6, 8, 10]
print(result)

result = list(map(jishu,l))#保存函数的返回值 [None, True, None, True, None, True, None, True, None, True]
print(result)

re = list(map(str,range(1,12)))#[‘1‘, ‘2‘, ‘3‘, ‘4‘, ‘5‘, ‘6‘, ‘7‘, ‘8‘, ‘9‘, ‘10‘, ‘11‘]
print(re)


def test():
    a=1
    b=2
    print(locals())# 返回局部变量 {‘a‘: 1, ‘b‘: 2}
    print(globals())#返回全局变量
# test()

a = [‘zjr‘,‘test‘,‘tzy‘]
b = [‘123‘,‘555‘,‘7867ty‘]
for u,p in zip(a,b):
    print(u)
    print(p)