Build-in Functions
参考 https://docs.python.org/3/library/functions.html#exec
| Build-in | * | * | * | * | |
|---|---|---|---|---|---|
| abs() | dict() | help() | min() | setattr() | |
| all() | dir() | hex() | next() | slice() | |
| any() | divmod() | id() | object() | sorted() | |
| ascii() | enumerate() | input() | oct() | staticmethod() | |
| bin() | eval() | int() | open() | str() | |
| bool() | exec() | isinstance() | ord() | sum() | |
| bytearray() | filter() | issubclass() | pow() | super() | |
| bytes() | float() | iter() | print() | tuple() | |
| callable() | format() | len() | property() | type() | |
| chr() | frozenset() | list() | range() | vars() | |
| classmethod() | getattr() | locals() | repr() | zip() | |
| compile() | globals() | map() | reversed() | __import__() | |
| complex() | hasattr() | max() | round() | set() | |
| delattr() | hash() | memoryview() |
重点
- all()
all(iterable)
Return True if all elements of the iterable are true (or if the iterable is empty). Equivalent to:
def all(iterable):
for element in iterable:
if not element:
return False
return True
-
any()
-
_import_
-
eval()
>>> x = 1
>>> eval('x+1')
2
- zip()
>>> x = [1, 2, 3] >>> y = [4, 5, 6] >>> zipped = zip(x, y) >>> list(zipped) [(1, 4), (2, 5), (3, 6)] >>> x2, y2 = zip(*zip(x, y)) >>> x == list(x2) and y == list(y2) True -
map(function,iterable)
- reduce(function,iterable[,initializer]
Python3 统计某字符串重复次数from functools import reduce sentences = ['The Deep Learning textbook is a resource intended to help students and practitioners enter the field of machine learning in general and deep learning in particular. '] word_count =reduce(lambda a,x:a+x.count("learning"),sentences,0) print(word_count) - filter(function,iterable)
相当于
(item for item in iterable if function(item)) if function is not None and (item for item in iterable if item) if function is None.
- enumerate()
对可迭代对象进行操作，加上index
In [26]: iter = ['coffee','tea','sugar']
In [27]: for i,text in enumerate(iter):
....: print i,text
....:
0 coffee
1 tea
2 sugar
-
lambda()
-
getattr()
-
chr()
-
ord()
**关于 Python操作内存，del **