12_for_loop.py

#======================================================================================
#                                   LOOPS
#--------------------------------------------------------------------------------------
# A loop is used to repeat a block of code multiple times automatically.
# Python has mainly two loops
# 1) for loop
# 2) while loop
#=====================================================================================

#======================================================================================
# FOR LOOP
#--------------------------------------------------------------------------------------
# A for loop is used to repeat a block of code for each item in a sequence.
# sequence can be: range(), list, tuple, string, set, dictionary
# for loop is used when you know how many times you want to repeat.
#--------------------------------------------------------------------------------------
# basic syntax
#--------------------------------------------------------------------------------------
# for variable in sequence:
#   code
#======================================================================================
#--------------------------------------------------------------------------------------
# for loop with range(start(default is 0 and inclusive), stop(exclusive), step(default is 1))
#--------------------------------------------------------------------------------------
# printing whole numbers from 0 to 9
for i in range(10): # Here 10 is exclusive
    print(f"Round:{i}")

# printing whole numbers from 1 t0 9
for i in range(1,10):
    print(f"Round:{i}")
# printing even numbers under 10
for i in range(2,10,2):
    print(f"Even:{i}")
# printing odd numbers under 10
for i in range(1,10,2):
    print(f"Odd:{i}")

#--------------------------------------------------------------------------------------
# for loop with string
#--------------------------------------------------------------------------------------
text = "Python"
loop = 0
for letter in text:
    loop += 1
    print(f"Iteration {loop} & letter-{letter}")
    
#--------------------------------------------------------------------------------------
# for loop with list
#--------------------------------------------------------------------------------------
numbers = [10,20,30,40,50]
for number in numbers:
    print(number)

# for loop real use cases
scores = [80, 50, 60, 75]
total = 0
for score in scores:
    score += total
    print(f"Current Total:{score}")
print(f"Final Total:{total}")

# data cleaning and transformation using for loop
files = [" DATA.csv", "report.txt ", " final.txt " ]
for file in files:
    file = file.strip().lower().replace("txt", "csv")
    print(file)
    
#--------------------------------------------------------------------------------------
# python challenge
# print the 7-times table from 1 t0 10 using for loop
#--------------------------------------------------------------------------------------
for i in range(1,11):
    print(f"7x{i}={7*i}")