Python Control Flow

Python Control Flow

if Statements
The if statement is used for conditional execution

x = 5
if x < 0:
    print('x is Negative')
elif x == 0:
    print('x is Zero')
elif x > 0:
    print('x is Positive')
else:
    print('x is not a number')

The while statement
The while statement is used for repeated execution as long as an expression is true

x = 0
while x < 6:
    print(x)
    x = x + 1:

for Statements
In Python’s for statement iterates over the items of any sequence (a list or a string)

fruits = ["apple", "orange", "banana", "cherry"]
for fruit in fruits:
    print(fruit)

The range() Function
If you do need to iterate over a sequence of numbers, the built-in function range() comes in handy. It generates arithmetic progressions

for i in range(5):
    print(i)

Output

0
1
2
3
4

More example on range

range(5, 10)
   5, 6, 7, 8, 9

range(0, 10, 3)
   0, 3, 6, 9

range(-10, -100, -30)
  -10, -40, -70

break and continue Statements
The break statement, breaks out of the innermost enclosing for or while loop
The continue statement, continues with the next iteration of the loop:
Break

for x in "string":
    if x == 'i':
        break
    else:
        print('inside loop')

Continue

for x in "string":
    if x == 'i':
        continue
    else:
        print('inside loop')

pass Statements

The pass statement does nothing. It can be used when a statement is required syntactically but the program requires no action

while True:
    pass

Define function
Functions are used to utilize code in more than one place in a program

def add(x, y):
    return x + y

print (add(1 + 2))
print (add(1.5 + 2.5))
print(add("Python is ", "awesome"))