[Python] Difference between function and method

[Note] Differences between python functions and methods

I thought that an object followed by a "." And a "()" was a method, but range () is called a function.

As a result of investigation, methods and functions were used properly, so a summary.

Difference between function and method

① Method

Only available in ** specific classes **.

Example: replace method It cannot be used for list (array), but it can be used for str (character string).

replace cannot be used in list

list = ['AAA', 'BBB', 'CCC']

# AttributeError: 'list' object has no attribute 'replace'

can be used with str

list = ['AAA', 'BBB', 'CCC']

# "['BBB', 'BBB', 'CCC']"

### ② Function Can be used for ** a wide range of objects ** (not tied to a particular class).

The ** built-in function ** that is built into python by default is applicable.

Main built-in functions

function Contents
type() Returns the type
tuple() Convert to tuple type
str() Convert to a string
set() Convert to set type
range() Returns an integer included in the specified range
open() Open file
list() Convert to list type
len() Returns the number of elements
int() Returns an integer (rounded down to the nearest whole number)
format() Change the format

-A list of built-in functions is here

Example: str function

Can be used for tuple

A = 1,2,3,4,5
type(A)  #Output: tuple


# str

Can be used for list

B = [1,2,3,4,5]
type(B)  #Output: list


# str

Can be used for set

C = {1,2,1,5,2,3,4,5}
type(C)  #Output: set


# str

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