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Python Theory

Control Statements (Looping Statements):

  • Program statements are executed sequentially one after another.In some situations, a block of code needs of times.
  • These are repetitive program codes, the computer has to complete tasks.
    • The following are the loop structures available in python.

    While Statement:

  • A while loop statement in python programming language repeatedly executes a target statement as long as a given condition is true.
    • Syntax
    while expression:
    statement(s)
    Example
    n =10
    # initialize sum
    sum =0
    i =1
    while i <=n:
    sum =sum+i
    i =i+1     print(" The sum is", sum)

    Using else statement with while loops

  • Python supports an else statement associated with a loop statement.
  • If the else statement is used with while loop, the else statement is executed when condition false.
    • Example
    counter =0

    while counter < 3:
    print("Inside loop ")
    counter = counter + 1     else: print("Inside else ")
    Output
    SkillPundit: Python-Conditional-Statement_if-Statement

    For Loop Statement:

  • The for loop is another repetitive control structure, and is used to execute a set of instructions repeatedly until conditions become false.
  • The for loop in python is used to iterate over a sequence(that is either list,tuple,string) or other iterable objects.
    • Syntax
    for val in sequence:
    Body of for loop
    Example
    # List of numbers
    numbers = [ 2,4,6,8,10 ]

    # variable to store the sum
    sum= 0

    # iterate over the list
    for val in numbers:
    sum= sum+val print("The sum is ", sum)

    Using else statement with file loops:

  • Python supports an else statement associated with a loop statement.
  • If the else statement is used with for loop, the else statement is executed when condition false.
    • Example
    digits = [ 0,2,5 ]

    for i in digits:
    print( i ) else:
    print("No items left.")
    Output
    SkillPundit: Python-Conditional-Statement_if-Statement

    Range() function:

    The range() function is used for a sequence of numbers, starting from 0 by default 1 and increment by 1.

    Syntax
    range(start, stop, step)
    Example
    # Defining Range
    print(range(5))

    print(list (range(5)))

    print(list (range(1,9)))

    print(list (range(2,10,3)))
    Output
    SkillPundit: Python-Conditional-Statement_if-Statement