Conditional Structures

I LOVE DOING THIS :)

Basic control flows

• Selection (if statements)

• Iteration (for loops)

What are For Loops ?

The for statement line will end with a colon : and the rest of the code block must be indented with a spacing of 4 spaces. An iterable is any object that can be looped on such as list, tuple, string

>>> fruits = ["apples", "oranges", "mangoes"]
>>> for fruit in fruits:
...     print(fruit)
...
apples
oranges
mangoes



>>> fruits = ["apples", "oranges", "mangoes"]
>>> for fruit in fruits:
...         size = 0
...     for alphabet in fruit:
...         size += 1
...     print("name of fruit: %s is has length %s" % (fruit, size))
...
name of fruit: apples is has length 6
name of fruit: oranges is has length 7
name of fruit: mangoes is has length 7

Looping on both indexes and items

If we working with the index, then you can call the enumerate function which returns a tuple of the index and the item

>>> names = ['adi','shiva','gaurav']
>>> for index, name in enumerate(names):
...    print('index is %s' % index)
...    print('name is %s % name')
...
index is 0
name is adi
index is 1
name is shiva
index is 2
name is gaurav

While Loops ?

While statement will execute a block of code as long as the condition is true

>>> names = ['james','michael','bobby']
>>> length = len(names)                    // Calculate the length in the list
>>> i = 0
>>> while i < length:
...    print(names[i])
...    i += 1
...
james
michael
bobby

What are IF blocks ?

>>> num = 44
>>> if num == 42:
...         print("number is 42")
...      elif num == 44:
...         print("num is 44")
...      else:
...         print("num is neither 42 nor 44")
...
num is 44