Python cs50, what happened with this simple code

Question

Good morning,

I’m starting a Python course by Cs50, but I don’t understand what happened to the code I wrote.

name = input("Name: ")

print("Hello, " + name)

You can see that it is simple and yet this error is shown in the terminal:

Name: alberty
Traceback (most recent call last):
  File "name.py", line 1, in <module>
    name = input("Name: ")
  File "<string>", line 1, in <module>
NameError: name 'alberty' is not defined

What I must do, is some configuration or error?

PS: I also did otherwise:

print(f"Hello, {name}")

And the result was this:

File "name.py", line 2
    print(f"Hello, {name}")
                         ^
SyntaxError: invalid syntax

Answer 1

Expensive,

The problem is the version of Python you are using. Some commands have changed from Python 2 to Python 3

Python 2

name = raw_input("Name: ")

print("Hello, " + name)

Note The command print may or may not have parentheses in Python 2

Other forms

print "Hello, " + name
print "Hello, %s" % name

Python 3

name = input("Name: ")

print("Hello, " + name)

or

name = input("Name: ")

print(f"Hello, {name}")

Note f-strings starting from version 3.6.

So use the command below to run your code:

python3 name.py

If you don’t have Python 3 installed, two options:

1. Install the Python 3
2. Modify the code to Python 2

I hope I’ve helped