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 ValueErrors, 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 ValueErrors 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, ValueErrors are raised when an operation or
function receives an argument of an inappropriate type. To avoid
ValueErrors, it is important to ensure that the arguments passed
to functions and operations are of the correct type. Exception
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 ValueErrors, 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 ValueErrors 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, ValueErrors are raised when an operation or
function receives an argument of an inappropriate type. To avoid
ValueErrors, it is important to ensure that the arguments passed
to functions and operations are of the correct type. Exception
