Translating Pseudocode steps into Python algorithm - python-3.x

Question

I'm entirely new to programming and I'm supposed to turn pseudocode into a Python algorithm for a class assignment. I've tested mine algorithm (if you can even call it that) a few too many times and keep coming up with error messages. Any suggestions or resources that might be able to help would be greatly appreciated!
Pseudocode Order:
Declare Real radius
Declare Real area
Display “ Enter value for radius : “
Input radius
Set area = 3.14 * radius * radius
Display Area
Attempted Code:
radius = 1.0
Area = 1.0
print(" Enter value for radius : ")
radius = input(" Enter value for radius : ")
Area = 3.14 * radius * radius
print(Area)
and the error:
TypeError: can't multiply sequence by non-int of type 'float'

Answer 1

input() returns a string, thus your TypeError. You tried to multiply a string by a float.
Updated Code here:
radius = 1.0
print("Enter value for radius : ")
radius = input()
print(type(radius))
Area = 3.14 * (float(radius) * float(radius))
print(Area)
Output:
Enter value for radius :
5
<class 'str'>
78.5

Answer 2

The best way to do this is:
import math
radius = input("Enter a radius: ")
area = math.pi * radius ** 2
print("The area is: " + str(area) + "cm squared.")
A few things happen here:
On the first line we import the math module, which contains a bunch of values (like π) and lots of methods (like tan). For more on modules, take a look here.
On the second line, we ask for the radius. Note that unlike lower level programming languages, we don't have to initialise it. Python figures out that it is an float (a decimal) by itself. EDIT: If you are using python 2, you do have to cast, just as Damien pointed out, by using radius = float(input("Enter an area: ))
On line three we set the area equal to πr^2. We call the math.pi value, which is very precise, then we multiply that by r ^ 2 (in python if we want to a to the power of b we write a ** b)
On line 4 we print the area as a String. Note that we have to cast the float area to be a string using the str() function. This is basically Java's easy way to print anything that isn't a string as a string (a collection of characters).
Hope that helps!

Answer 3

Well, I will add some explain to this:
radius = 1.0 #this is not mandatory, you can create the variable and assign the value in the same moment
area = 1.0
radius = float(input(" Enter value for radius : ")) #here is so important to convert the input into a float, that's the other error you had
area = 3.14 * radius * radius t isn't working
print(area)