Cheatsheet

ฟังก์ชัน Built-in

In Python, we have a function that calculate the product built-in to python.
See it all here : https://docs.python.org/3/library/functions.htmlopen in new window

การที่จะตั้งชื่อฟังก์ชั่นนั้นไม่ได้ตั้งชื่ออะไรก็ได้นะครับ โดยชื่อฟังก์ชั่นที่ Python จองไว้ไม่ให้ตั้งชื่อเหมือน จะมีดังนี้ครับ

และเช่นเดียวกัน เราก็สามารถใช้ฟังก์ชั่นที่ Python ทำไว้แล้วได้เช่นเดียวกัน โดยการเรียกเหมือนกับฟังก์ชั่นธรรมดาเลย

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()
delattr()hash()memoryview()set()

Using abs()

abs() is absolute in math language. Absoulte will returns a positive number from the value

How to use
abs(<value>)

Example
abs(10)     # Returns 10
abs(-10)    # Returns 10

Using chr()

chr() converts number (integer only) to ASCII character.

How to use
chr(<integer>)

Example
chr(65) # Returns 'A'
chr(97) # Returns 'a'

Using ord()

ord() converts single ASCII character to number (integer).

How to use
ord(<character>)

Example
ord('A') # Returns 65
ord('a') # Returns 97

Using len()

Mostly used with for loops. len is equal to length of something.

How to use
len(<integer>)
len(<string>)
len(<array>)

Example
len(10)     # Equals to 0 to 9
len(1, 10)  # Equals to 1 to 10

len("Happy") # Returns 5
len("A") # Returns 1

len([1, 2, 3, 4, 5]) # Returns 5

Using max()

Function will return the largest number from 2 arguments

How to use
max(<arguments_1>, <arguments_2>)

Example
max(1, 2) # Returns 2

a, b = 20, 10
max(a, b) # Returns 20

Using min()

Function will return the smallest number from 2 arguments

How to use
min(<arguments_1>, <arguments_2>)

Example
min(1, 2) # Returns 1

a, b = 20, 10
min(a, b) # Returns 10

Using pow()

Caculates a exponential values by using functions. This is absolutely optional way to calculate exponent

How to use
pow(<number>, <exponent power>, <modulo by>)

Example
pow(2, 3) # Returns 8
pow(2, 3, 2) # Returns 0 (as 2**3 % 2)

Using round()

Returns a number that will be rounded up (if >= .5) or round down (if < .5)
If you want to forced round up or round down, You can use math library to help

How to use
round(<number>, significant number)

Example
round(12.1) # Returns 12
round(12.153, 2) # Returns 12.15

Using sorted()

Returns a arrays of values that have been sorted, pending on their value types
Parameter reverse is when you want to sort in descending order
Parameter key is when you want to sort dictionary using only some data to determine

How to use
sorted(<lists of arrays>, reverse=False, key=none)

Example
text = [10,9,8,7,6,5,4,3,2,1]
sorted(text) # Returns [1,2,3,4,5,6,7,8,9,10]

Using chr() float() int()

chr(<value>)
float(<value>)
int(<value>)

Example
number = 12
chr(number) # Returns '12'

number = '12'
float(number) # Returns 12.0

number = 12.55
int(number) # Returns 12

chr() convert value to string type (if possible)
float() convert value to float type (if possible)
int() convert value to integer type (if possible)