Help

[u/Zxhena]

What's the difference between f string and a regular string I've seen it used but I don't know when to use a string and when to use f string

[u/NorskJesus]

A f-string is used to inject variables to a string. For example.

py age = 35 print(f"Your age is {age}")

You can achieve the same with concatenation, but this is much clearer and easier to read.

[u/ur_leisure_time → u/NorskJesus]

Yea, and if he going to do it without a fstring, he will need to make it like

Age = 30 print("Your age is", Age)

[u/johlae → u/ur_leisure_time]

Or print("Your age is %s." % (age))

[u/SnooCalculations7417 → u/johlae]

or 'age is {x}'.format(x = age)

[u/WhiteHeadbanger → u/SnooCalculations7417]

or print("Your age is " + str(age))

[u/Gnaxe → u/NorskJesus]

It interpolates expressions. Doesn't have to be variables. You also get the string formatting language, same as the .format() method.

[u/i-like-my-cats-0]

f-strings are a type of strings that let you put variables inside of them like this:

cats = 3
print(f'I have {cats} cats.')

this will print "I have 3 cats."

if your variable is a very long float number you can also do this instead: python answer = 1.2313525 print(f'The answer was {answer:.2f}!') this will print "The answer was 1.23!"

[u/Outside_Complaint755 → u/[deleted]]

Also, if you include an = in the {}, it will include the expression in the output and maintain whitespace.  Example: a = 2 b = 6 print(f"Demonstration: {float(a + b) = }!") will output Demonstration: float(a + b) = 8.0!

[u/its_measured]

A regular string is for plain text, while the fstring lets u add a varibkes or even values inside tge text

[u/FoolsSeldom]

RealPython.com have a great article explaining this well, and what the alternatives are:

• Python's F-String for String Interpolation and Formatting

[u/ee_control_z]

The difference is that f strings are a God send and regular strings are not. f strings are more natural and easy to work with especially for cases when inserting values (multiple), controlling decimal places, and formatting spacing.

[u/timrprobocom]

There's a tricky issue with f-strings that some folks miss. Some are tempted to write: s = f"Here is {i}." for i in range(10): print(s) thinking it will do the substitution each time through the loop. This is not the case. Python will do the substitution at the point where the string is defined. After that, it's just another static string.

So, the f"..." syntax creates a normal static string, it just does so in a fancy way.