Cheat sheet for Python tuples

python_tuples.py

#### Tuple creation #####
# Create a tuple, also called tuple packing.
numbers = 1, 2
print(numbers) # Output: (1, 2) <- Note that it is represented with an enclosing paranthesis
# Create tuple with paranthesis.
numbers = (1, 2, 3)
print(numbers) # Output: (1, 2, 3)
# Create an empty tuple.
numbers = ()
print(numbers) # Output: ()
# Create a tuple with one item. Note that the trailing comma is necessary
numbers = 1,
print(numbers) # Output: (1,)
# Create a tuple with heterogenous items.
random_tuple = "Hey", (1, 2), 1, ["you"]
print(random_tuple) # Output: ("Hey", (1, 2), 1, ["you"])
# Create tuple with tuple() constructor.
numbers = tuple()
print(numbers) # Output: ()
numbers = tuple([1, 2]) #  Takes any sequence as input
print(numbers) # Output: (1, 2)

#### Methods on tuples #####
# Get length of list by using len() method.
numbers = 5, 8, 8
print(len(numbers)) # Output: 3
# Get index of an element using the index() method.
numbers = 5, 8, 8
print(numbers.index(8)) # Output: 1
# Count occurences of an item in a tuple.
numbers = 5, 8, 8
print(numbers.count(8)) # Output: 2

# Access elements of a tuple by indexing.
str_tuple = "hey", "there!", "how", "are", "you?"
print(str_tuple[0]) # Output: "hey"
print(str_tuple[len(str_tuple) - 1]) # Output: "you?"
print(str_tuple[-1]) # Output: "you?"

# Slicing a tuple.
str_tuple = "hey", "there!", "how", "are", "you?"
print(str_tuple[2:]) # Output: ("how", "are", "you?")
print(str_tuple[:2]) # Output: ("hey", "there!")
print(str_tuple[-3:]) # Output: ("how", "are", "you?")
print(str_tuple[:-3]) # Output: ("hey", "there!")
print(str_tuple[1:4]) # Output: ("there!", "how", "are")
# Get a copy of the tuple by slicing.
print(str_tuple[:]) # Output: ("hey", "there!", "how", "are", "you?")

# Concatenate tuples.
numbers = (1, 2)
strings = ("Hey", "there")
print(numbers + strings) # Output: (1, 2, "Hey", "there")

# Tuples are immutable, that is, we cannot change its contents.
numbers = (1, 2, 3)
numbers[0] = 100 # Gives error: TypeError: 'tuple' object does not support item assignment
del numbers[0] # Gives error: TypeError: 'tuple' object doesn't support item deletion

# Looping through tuple using 'in'.
numbers = 1, 2
for number in numbers:
  print(number)
  
# Check if element is present in tuple.
numbers = 1, 2
print(1 in numbers) # Output: True
print(5 in numbers) # Output: False

# Delete tuple using del keyword.
numbers = 1, 2
del numbers

# Tuple packing.
# We are packing two items 1 and 2 into the tuple.
numbers = 1, 2
# Tuple sequence unpacking. 
# Number of variables used has to be same as the number of items in the tuple.
# Unpacking the tuple and assigning its items to x and y.
x, y = numbers 
# Note that this is also packing the args as a tuple which gets unpacked as the print method's arguments.
print(x, y) # Output # (1, 2)

Nice Wor6

This is very helpful...many thanks