↑ Python

---

Python - Type Conversion or Casting

bool()

see: Booleans

bool(1) # True
bool(0) # False

int()

Converts a value to an integer, when using it for a float it doesn't round the number up

x = int("10")  # Convert the string "10" to the integer 10
print(x)       # Displays : 10
print(type(x)) # Displays : <class 'int'>

int(9.555555) # 9

round()

Round a float to the next integer or the desired decimal if specified

round(9.555555) # 10
round(9.555555, 2) # 9.56

float()

Converts a value to a decimal number

y = float("3.14")  # Convert the string"3.14" to the decimal number 3.14
print(y)         # Displays : 3.14
print(type(y))   # Displays : <class 'float'>

str()

Converts a value to a string

y = str(3)       # Convert the integer 3 to the string "3"
print(y)         # Displays : 3
print(type(y))   # Displays : <class 'str'>

list()

Converts a value to a list

y =  list('hello') # Convert the string 'hello' to a list
print(y)           # Displays : ['h', 'e', 'l', 'l', 'o']
print(type(y))     # Displays : <class 'list'>

set()

my_set = set([1, 2, 3, 'hello']) # from a list
my_set = set((1, 2, 3, 'hello')) # from a tuple

Using with input()

input() returns a string, in order to use numeric operations on an user input you need to convert it first

age = int(input("Enter your age : "))  # Converts the input to an integer
print(age + 5) # Do a numeric operation

[!WARNING]

• If an user input a value that cannot be converted to an integer or a float a ValueError will be raised
• You must ALWAYS validate user input before trying to convert it