Tuples

An ordered collection or grouping of items

• It’s immutable!!
  • Makes your code more safe because you can exist it to not change
• Tuples are faster than lists!
• Can use tuples as valid keys in a dictionary
• Data in tuple doesn’t have to be unique

nums = (1,2,3,4,3)
3 in nums # True
 
# Can access just like a list
nums[0] # 1
# CANNOT reassign elements
nums[0] = 7 # Error
 
# Using tuples as keys
locations = {
	 (30,120):"house",
	 (48.6, 92.5):"company"
}
 
# nested tuples
x = (1,2,3,(4,5),6)

Tuple looping

# same as list
names = ("colt", "blue")
for name in names:
	print(name)

Methods

• count, index, slicing

# count: Number of times a value appears in tuple
	x = (1,2,3,3,3,3,4)
x.count(2) # 1
x.count(3) # 4
 
# index: the index at which a value is found
x.index(2) # 1
x.index(3) # 2
x.index(3,3) # 3
 
# slices
x[-1] # 4

Notes

num = (range(0,3))  
print(num) #range(0, 3)  
 
num = tuple(range(0,3))  # MAKE SURE TO ADD THE KEYWORD 'TUPLE'
print(num) #(0,1,2)
 
num = tuple(num**2 if num % 2 == 0 else num + 1 for num in range(0,5))  
print(num) # (0, 2, 4, 4, 16)
 
"""Single element tuple"""
num = (1)
type(num) #int
num = tuple(1) # GIVES ERROR
num = (1,) # adds comma to distinguish it from the regular expression
 
 
"""list to tuple"""
a = [1,2,3]
tuple(a) # (1,2,3)