Python List comprehensions

Python List comprehensions

List comprehensions

You can use a loop to generate a list based on a range of numbers or on another list. This is a common operation, so python offers a more efficient way to do it. List comprehensions may look complicated at first: if so, use the for loop approach until you're ready to start using comprehensions.

To write a comprehension, define an expression for the values you want to store in the list. Then write a for loop to generate input values needed top make the list.

#Using a loop to generate a list of square numbers
squares = []
for x in range(1, 11):
 square = x**2
 squares.append(square)
#Using a comprehension to generate a list of square numbers
squares = [x**2 for x in range(1, 11)]
#Using a loop to convert a list of names to upper case
names = ['kai', 'abe', 'ada', 'gus', 'zoe']

upper_names = []
for name in names:
	upper_names.append(name.upper())
#upper a comprehension to convert a list of names to upper case
names = ['kai', 'abe', 'ada', 'gus', 'zoe']

upper_names = [name.upper() for name in names]
print(upper_names)

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