I'm new Python and getting a KeyError trying to use the format() function:
def hello( name="Sean", age=0 ):
return 'Hello, ' + name + " you are { age } years old".format( age )
sentence1 = hello( 'Mark', 17 )
Error:
KeyError: ' age '
What am I doing wrong?
If you use a a named placeholder in the format string, you need to provide named arguments.
And you shouldn't have spaces around the name in the placeholder.
def hello( name="Sean", age=0 ):
return 'Hello, ' + name + " you are {age} years old".format(age=age)
{ age }Just use a modern f string approach.
def hello( name="Sean", age=0 ):
return f'Hello, {name} you are {age} years old.'
.format() for age because it's an int rather than a string, so it can't be concatenated.Remove the word 'age' in between the curly brackets. As such
def hello( name="Sean", age=0 ):
return 'Hello, ' + name + " you are {} years old".format( age )
sentence1 = hello( 'Mark', 17 )
Just use f strings.
def hello( name="Sean", age=0 ):
return (f'Hello, {name} you are {age} years old.')
sentence1 = hello( 'Mark', 17 )
print(sentence1)
I suggest using f-strings: they allow you to format directly in your string. Do notice that you have to put an f before the quotation marks.
print(f"Hello {name} you are {age} years old")
If you want to format your text and fill a string with some variables, you can put them in format method "in your desired" order.
if there is just one variable, you can change your code to this:
def hello( name="Sean", age=0 ):
return 'Hello, ' + name + " you are {} years old".format(age)
sentence1 = hello( 'Mark', 17 )
Also this one works:
def hello( name="Sean", age=0 ):
return 'Hello, ' + name + " you are {age} years old".format(age=age)
sentence1 = hello( 'Mark', 17 )
In some cases, you maybe want to have multiple variables. You can use second method to your code be more readable.
Also using f-string is on the table (recommended). like this:
def hello( name="Sean", age=0 ):
return f"Hello, {name} you are {age} years old"
sentence1 = hello('Mark', 17)
remove a space and pass age variable to format
"you are {age} years old".format(age=age)
def hello( name="Sean", age=0 ):
return 'Hello, ' + name + " you are {age} years old".format(age=age)
sentence1 = hello( 'Mark', 17 )
When you use .format, the curly brakets has to be empty:
def hello( name="Sean", age=0 ):
return 'Hello, ' + name + " you are {} years old".format(age)
sentence1 = hello( 'Mark', 17 )
You sould consider using f"" as so:
return f'Hello, {name} you are {age} years old'
This way you can directly put variables in your string
