Python learning diary [2]

Tuple: (with ())

And list are different:

1, the list is more flexible, you can add the deletion of arbitrary elements, tuples once created can not be changed;

>>> dir (test)

[' __add__ ', ' __class__ ', ' __contains__ ', ' __delattr__ ', ' __doc__ ', ' __eq__ ', ' __format__ ', ' __ge__ ', ' __getattribute__ ' ', ' __getitem__ ', ' __getnewargs__ ', ' __getslice__ ', ' __gt__ ', ' __hash__ ', ' __init__ ', ' __iter__ ', ' __le__ ', ' __len__ ', ' __lt__ ', ' __mul__ ', ' __ne__ ', ' __new__ ', ' __reduce__ ', ' __reduce_ex__ ', ' __repr__ ', ' __rmul__ ', ' __setattr__ ', ' __ Sizeof__ ', ' __str__ ', ' __subclasshook__ ', ' count ', ' index ']

>>> test[1:]

(2, 3, 4)

>>> Test[:3]

(1, 2, 3)

>>> test[1:]

(2, 3, 4)

>>> Test[:3]

(1, 2, 3)

P.S.

1. The types of elements in lists and elements are not qualified, can be nested, somewhat similar to jagged arrays

2. Slicing

Format Operation string:

1, similar to the C language in the printf class function requirements of the formatted input.

2, the escape of the format control character.

Sequence:

1, List (), New empty list

List (iterable), new list initialized from iterable ' s items

2. ZIP ()---the zip function accepts any number of sequences (including 0 and 1) as parameters, returning a tuple list.

Function:

Define DEF return_value function_name (parameters):

#函数实现

1, function nesting---python support function inline-function internal definition function;

2, Function closure---sub-function can use local variables in the parent function, this behavior is called closure!

Example plots

3. Expand Reading

Python learning diary [2]