Python Learning Day2 (ii)

1. Class-to-object relationships

For Python, everything is an object, objects are created based on the class

Type is the class that gets the

Dir is to get the members inside this class

2.int Internal Function Introduction

Bit_length: Returns the minimum number of digits that the current number occupies;

Conjugate: Returns the conjugate complex number of a complex number

__ABS__: Return absolute value (or ABS (-11))

__ADD__: Add (+)

__AND__: and operations

__CMP__: Compare two-digit size (canceled in 3.x)

__BOOL__: Converting to a Boolean value

__divmod__: Divide, get quotient and remainder composition Ganso

__eq__: equals (= =)

__FLOAT__: Create new floating-point data based on the original data

__FLOORDIV__: Floor removal (//)

__GE__: greater than or equal to

__GT__: Greater Than

__init__: Construction method

__POW__: Power operation

Plus R is the right-to-left operation.

Float Internal Function Introduction

As_integer_ratio (self): Gets the simplest ratio of the value change

Fromhex (Self, string): Converts a hexadecimal string to a floating-point type

Hex (self): Returns the 16 binary representation of the current value

Introduction to STR internal functions

Capitalize (self): Capitalize first letter

Center (self, Width, fillchar=none): Content centered, Width: total length; Fillchar: padding content in white space, default None

Count (self, sub, Start=none, End=none): Number of subsequence

Decode (self, Encoding=none, Errors=none): Decoding

Encode (self, Encoding=none, Errors=none): encoding, for Unicode

EndsWith (self, suffix, start=none, end=none): Whether to end with XXX

Expandtabs (self, tabsize=none): Converts tab to space, default one tab to 8 spaces

Find (self, sub, Start=none, End=none): Find the sub-sequence position, if not found, return –1

Format (*args, **kwargs): string formatting, dynamic arguments, speaking of functional programming

Index (self, sub, Start=none, End=none): Sub-sequence position, if not found, error

Isalnum (self): whether it is a letter or a number

Isalpha (self): whether it is a letter

IsDigit (self): Whether it is a number

Islower (self): lowercase

Join (self, iterable): Connect

Ljust (self, Width, fillchar=none): Content left aligned, right padding

Lower (self): variable lowercase

Lstrip (self, chars=none): Remove left margin

Partition (self, SEP): Split, front, middle, last three parts

Replace (self, old, new, Count=none): replace

Split (self, Sep=none, Maxsplit=none): Split, maxsplit up to several times

Splitlines (self, Keepends=false): Split by line break

StartsWith (self, prefix, Start=none, End=none): whether to start

Strip (self, Chars=none): Remove both ends of the gap

Swapcase (self): uppercase to lowercase, lowercase to uppercase

Translate (self, table, Deletechars=none): conversion, you need to make a corresponding table, the last one represents the deletion of the character set

Zfill (self, width): The method returns a string of the specified length, the original string is right-aligned, and the front padding is 0.

List Internal function introduction

Append (self, p_object): Adds a new element to the tail of the list. Only one parameter is accepted.

Count (self, value): Counts the number of occurrences of an element in a list

Extend (self, iterable): Accepts only one list as an argument and adds each element of the parameter to the original list.

Index (self, value, Start=none, Stop=none): Used to find the index position of the first occurrence of a value from the list, and throws an exception if no object is found

Insert (self, Index, p_object): Inserts an element into the list, but has two parameters (such as insert (1, "G")), the first parameter is the index point, which is the position of the insertion, and the second parameter is the inserted element.

Pop (self, index=none): Removes an element from the list (the last element by default) and returns the value of the element

Remove (self, value): Removes the first occurrence of a value in the list.

Reverse (self): used to reverse the elements in the list

Sort (self, cmp=none, Key=none, Reverse=false): Sorts the original list and, if specified, uses the comparison function specified by the comparison function

Introduction to the internal functions of tuple

Count (self, value): Counts the number of occurrences of an element in a tuple

Index (self, value, Start=none, Stop=none): Used to find the index position of the first occurrence of a value from a tuple, and throws an exception if no object is found

Dict Internal Function Introduction

Clear (self): clear content

Copy (self): shallow copy

Get (self, k, d=none): Gets the value according to key, D is the default value

Has_key (self, k): Is there a key

Items (self): List form for all items

Iteritems (self): item can be iterated

Iterkeys (self): Key can iterate

Itervalues (self): value can be iterated

Keys (self): List of all keys

Pop (self, k, d=none): Deletes the value corresponding to the given key, returns the value and removes it from the dictionary

Popitem (self): randomly returns and deletes a pair of keys and values (items) in the dictionary

SetDefault (self, k, d=none): If key does not exist, it is created, if present, returns the existing value and does not modify

Update (self, E=none, **f): Updated

VALUES (self): all values

Viewitems (self): All items, just save the content to the View object

Python Learning Day2 (ii)