Old boy Learning Python 5 built-in functions and file operations

Lambda expression:

Built-in functions:

ABS: Absolute Value:

All: The loop parameter, if each element is true, then the return value of all is true

Any only one true, then true

ASCII, using _repr_ in the object, gets the return value:

INT: Converts the other binary data into decimal data:

Bin: Converting a string to bytes

BOOL is judged to be true or FALSE, converting an object to a Boolean value

CHR: Converts 10-binary data to letters in ASCII

Ord: Converting characters in ASCII to decimal characters

Radmon Module

Random.randrange (1.8) generates random numbers from 1 to 8:
Random Verification Code:

Callable: What objects can be executed

Compile: Compiling

Complex Negative

Delattr: Reflection

Divmod (the quotient and remainder form an element)

Eval: Converting a string into an expression

EXEC has no return value to handle the syntax of complex py

EXEC (' For I in range (1,100,2):p rint (i) ')

1, Cmpile compile code 2, execute code

Filter (function, object that can be iterated)

MAP; A function can iterate over an object and make a collection of the returned results

Isinstance: Determines whether an object is created by a class

Issubclass judgment is not a parent class.

ITER creates an object that can be iterated, often with next value, yield mate, generator

Max, Min take maximum and minimum values

POW: Seeking Index

I=pow (2,10)

Round rounding 2.6 will turn into 3 2.5 is 2

Sum sum

ZIP: Put together two elements in a group

-import (aliases when importing)

T

file operations; open

R, read-only mode (default)

W, write-only mode (not readable if the file does not exist, created)

X, write-only mode (unreadable, file not created, error present, used to create file)

A, append mode (there is no creation, there can be additional content

r+, read and write

w+ Write Read

x+ Write Read

A + write read

As long as the write operation is performed, the pointer will be placed in the last

Old boy Learning Python 5 built-in functions and file operations