python programming

Getting User Input and
Concatenation
The input() function

 Used to get user input
 Returns a string value
 Can be concatenated with other strings
Concatenation

 Joining two or more strings together
 Use the + operator for concatenation

Example
name = input("What is your name? ")
print("Hello, " + name)
ValueError

 Occurs when an operation or function receives a value
of an inappropriate type
 Example: Trying to convert a string to an integer using
the int() function and the string does not contain a
number
age = int(input("What is your age? "))
Displaying Results

 Use the print() function

 Accepts any number of arguments
 Separate arguments with commas
Age Calculator Concept

, Create a program that calculates a user's age
 Get user's birth year and current year
 Calculate the difference between the two
 Display the result using the print() function

birth_year = int(input("What year were you
born? "))
current_year = int(input("What is the current
year? "))
age = current_year - birth_year
print("You are " + str(age) + " years old.")
Getting User Input and Concatenation

 Use the input() function

 Get user input as a string
 Concatenate strings with the + operator

 Display results with the print() function

 Handle ValueErrors as needed

Value Error: TypeError caused
by invalid value
In Python, a ValueError is a type of exception that is
raised when an operation or function receives an
argument of an inappropriate type. This is typically
caused by passing an argument of a type that is not
expected by the function or operation.

One common example of a ValueError is
the TypeError , which is raised when an operation or

,function receives a value of an inappropriate type. For
instance, consider the following code:

name = "John"
age = "thirty"
print(f"{name} is {age} years old.")
This code will produce the following output:

John is thirty years old.
However, this output is incorrect because the value
of age is a string, not an integer. To fix this error, we
can use the int() function to convert the string value
of age to an integer:

name = "John"
age = "thirty"
age = int(age)
print(f"{name} is {age} years old.")
This code will produce the following output:

John is 30 years old.
By using the int() function, we have converted the
string value of age to an integer, which allows
the print() function to correctly display the age of the
person.

Other examples of ValueError include passing a string
to a function that expects an integer, or passing a list to
a function that expects a dictionary. In general, to
avoid ValueError s, it is important to ensure that the
arguments passed to functions and operations are of the
correct type.

, It is also important to note that ValueError s can be
handled using exception handling techniques in Python.
This allows the program to continue running even if
a ValueError occurs, and provides a way to gracefully
handle and recover from the error.

In summary, ValueError s are raised when an
operation or function receives an argument of an
inappropriate type. To avoid ValueError s, it is
important to ensure that the arguments passed to
functions and operations are of the correct type.
Exception handling techniques can also be used to
handle and recover from ValueError s.


Displaying Results: Usage
of print function
The print function is used to display results in Python.
Here's how to use it:

 print("Hello, World!") displays the string "Hello,
World!"
 print(5+3) displays the result of the arithmetic
operation 5 + 3

 print(5>3) displays the result of the comparison
operation 5 > 3

You can also print the values of variables:

 x = 5

 y = 3

 print(x + y) displays the result of 5 + 3