Part 5: Input and Output Functions, Loops

• Access the lecture material here

---

26. Python print() Tutorial : Printing single and multiple values, sep & end parameters

Lecture Video

Code Snippet

#Printing single value
print("------Printing single value------")
a,b = 10,20
print("Hello world!")
print(10)
print(a+b)

#Printing multiple values
print("------Printing multiple values------")
a,b,name = 10,20,"Sachin"
print(10,20,30)
print("Hello", name)
print("Sum:", a+b)

#sep parameter
print("------sep parameter------")
a,b,c = 10,20,30
print(a,b,c)
print(a,b,c, sep=" ")
print(a,b,c, sep="-")
print(a,b,c, sep="\t") #\t -> tab

#\n - newline
print("Hi Sachin\nHow are you?")

#end parameter
print("------end parameter------")
print("Sachin")
print(25)
print("India")

print("Sachin", end = "-")
print(25, end = "-")
print("India")
print("Hello world!")

#Example 1
print("------Example 1------")
print(10, 20, 30) #same as print(10, 20, 30, sep=" ", end="\n")
print("Sachin", "Sourav", "Rahul")
print("End of example")

#Example 2
print("------Example 2------")
print(10, 20, 30, sep="-", end="***")
print("Sachin", "Sourav", "Rahul", sep="-", end="***")
print("End of example")

#Example 3
print("------Example 3------")
print(10, 20, 30, sep="\n", end="***")
print("Sachin", "Sourav", "Rahul", sep="-")
print("End of example")

---

27. Python print() Tutorial: String Concatenation vs Comma

Lecture Video

Code Snippet

#String concatenation vs comma
print("------String concatenation vs comma------")
age, name = 25, "Sachin"
print("Name is "+name)
print("Name is", name)
#print("Age is "+age) # Will result in TypeError
print("Age is", age)
print("Age is "+str(age))

---

28. Python input() function: How Python Programs Take User Input

Lecture Video

Code Snippet

print("Program started")
name = input("Enter your name:")
print("Hello", name)

print("Find sum of two integers:")
a = int(input("Enter first integer number: ")) # "10" ---- not 10
b = int(input("Enter second integer number: ")) # "20" ---- not 20
print("Sum:", a+b)

print("Find total cost:")
item_count = int(input("Enter no of items: "))
price = float(input("Enter price of one item: "))
print("Total cost:", item_count * price)

---

29. While Loops Tutorial - Part 1: Simple while loop, Infinite loop, and Examples

Lecture Video

Code Snippet

# Printing first n natural numbers
print("Printing first n natural numbers")
n = 5
i = 1
while i<=n:
    print(i)
    i = i + 1
print("End of loop")

# Infinite loop
# while True:
#     print("hello")

# Printing first n natural numbers
print("Printing first n natural numbers")
n = 5
i = 1
while True:
    if i>n:
        break
    print(i)
    i = i + 1
print("End of loop")

# Add integer numbers till user enters 0 -> Using while True + break syntax
print("Add integer numbers till user enters 0 -> Using while True + break syntax")
total = 0
while True:
    number = int(input("Enter an integer number (0 to stop): "))
    if number == 0:
        break
    total = total + number
print("Sum:", total)

# Add integer numbers till user enters 0 -> Using while condition syntax
print("Add integer numbers till user enters 0 -> Using while condition syntax")
total = 0
number = int(input("Enter an integer number (0 to stop): "))
while number != 0:
    total = total + number
    number = int(input("Enter an integer number (0 to stop): "))
print("Sum:", total)

---

30. While Loops Tutorial - Part 2: Input Data Validation, Break and Continue statements

Lecture Video

Code Snippet

# Age validation - Using infinite loop + break
while True:
    age = int(input("Enter age: "))
    if age >= 0:
        break
    print("Age should not be negative")
print("Age is:", age)

# Age validation - Using while condition syntax
print("Age validation - Using while condition syntax")
age = int(input("Enter age: "))
while age<0:
    print("Age should not be negative")
    age = int(input("Enter age: "))
print("Age is:", age)

# Using break and continue statements
print("Using break and continue statements")
total = 0
while True:
    number = int(input("Enter an integer number (0 to stop): "))
    if number == 0:
        break
    if number <0:
        print("Skipping negative number")
        continue
    if number%5 == 0:
        print("Skipping multiple of 5")
        continue
    total = total + number
print("Sum:", total)

# Using break and continue statements with while condition syntax
print("Using break and continue statements with non-infinite loop")
total = 0
number = int(input("Enter an integer number (0 to stop): "))
while number != 0:
    if number==500:
        break
    if number<0:
        print("Skipping negative number")
        number = int(input("Enter an integer number (0 to stop): "))
        continue
    total = total + number
    number = int(input("Enter an integer number (0 to stop): "))
print("Sum:", total)

---

31. While Loops Tutorial - Part 3: Nested loops, Using Truthy/Falsy Values

Lecture Video

Code Snippet

# Nested while loops example
print("Nested while loops example")
n = 5
while n >= 1:
    print("n:", n)
    i = n
    while i >= 1:
        print("Python")
        i = i-1
    n = n-1

# Using Truthy / Falsy values with while loops
print("Using Truthy / Falsy values with while loops")
n = 5
while n:
    print(n)
    n = n-1

---