obj=iter([11,22,33,44])

print(obj)

r1 = next(obj)

print(r1)

r2 = next(obj)

print(r2)

没了就会报错的

yield==>

isinstance 判断某个对象是否是某个类创建的

r = isinstance(li,list)

print(r)

list可以是其父类

map(函数,可以迭代的对象）

# def f1(x):
#     if x>2:
#      return True
#     else:
#      return False
# ret = filter(f1,[0,1,2,3,4,5])
# for i in ret:
#     print(i)

def f1(x):
    return x+100
#ret = map(f1,[1,2,3,4,5])
ret = map(lambda x:x+100,[1,2,3,4,5,6,])
print(ret)
for i in ret:
    print(i)

C:\Users\Administrator\AppData\Local\Programs\Python\Python36-32\python.exe “C:\Program Files\JetBrains\PyCharm 2017.2\helpers\pydev\pydevd.py” –multiproc –qt-support=auto –client 127.0.0.1 –port 1064 –file C:/Users/Administrator/PycharmProjects/py/recover.py
pydev debugger: process 4952 is connecting

Connected to pydev debugger (build 172.3317.103)
<map object at 0x02E71030>
101
102
103
104
105
106

Process finished with exit code 0

Filter(函数，可以迭代的对象)

循环可以迭代的对象，获取每一个参数，函数（参数）

def f1(x):

return True

filter(f1,[11,22,33,44])

def f1(x):
if x % 2 == 0:
return True
else:
return False

ret = list(filter(f1, [11, 22, 33, 44]))
print(ret)

ret2 = list(filter(lambda x: x % 2 == 0, [11, 22, 33, 44, 55, 66, ]))
print(ret2)

C:\Users\Administrator\AppData\Local\Programs\Python\Python36-32\python.exe “C:\Program Files\JetBrains\PyCharm 2017.2\helpers\pydev\pydevd.py” –multiproc –qt-support=auto –client 127.0.0.1 –port 10054 –file C:/Users/Administrator/PycharmProjects/py/filter_test.py

pydev debugger: process 892 is connecting

Connected to pydev debugger (build 172.3317.103)

[22, 44]

[22, 44, 66]

Process finished with exit code 0

可执行了

C = chr(66)

print(c)

i=ord(“a”)

print(i)

#!/usr/bin/env python
#-*-coding:utf-8-*-
def f1():
return 123
print(f1())
f2 = lambda : 123
print(f2())

def f3(a1,a2):
return a1+a2
f4=lambda a1,a2:a1+a2
print(f3(1,2))
print(f4(2,3))

#all
i=oct(10)
print(i)
i=int(0x15)
print(i)
ii=int(0b110101010101)
print(ii)

i = int(“100”,base=13)
print(i)

i=oct(10)
print(i)
i=int(0x15)
print(i)
ii=int(0b110101010101)
print(ii)

i = int("0xe",base=16)

print(i)/14