Control Structures

Iteration

While Loops

while i <= 5:

doSmth()

For Loops

for item in [1, 2, 3, 4]:

print(item)

Looping with Index

n = len(arr)

for i in range(n):

do_smth(arr[i])

or

for idx, val in enumerate(ints):

print(idx, val)

Selection

If-Elif-Else

if item >= 10:

print('yes')

elif item == 5:

print('yup')

else:

print('ok')

List Comprehension with Iteration & Selection

Normal way:

alist = []

for x in range(0, 11):

alist.append(x*x)

With list comprehension:

alist = [x*x for x in range(0, 11)]

Specify criteria:

alist = [x*x for x in range(0, 11) if x%2 == 0]

[ch.upper() for ch in 'comprehension' if ch not in 'aeiou']