What is print(f“…”)

Question

I am reading through a python script that takes an input of XML files and outputs an XML file. However, I do not understand the printing syntax. Can someone please explain w

Answer 1

In Python 3.6, the f-string was introduced(PEP 498). In short, it is a way to format your string that is more readable and fast.

Example:

agent_name = 'James Bond'
kill_count = 9

# old ways
print('{0} has killed {1} enemies '.format(agent_name,kill_count))

# f-strings way
print(f'{agent_name} has killed {kill_count} enemies')

The f or F in front of strings tell Python to look at the values inside {} and substitute them with the variables values if exists. The best thing about the is that you can do cool stuff in {}, e.g. {kill_count * 100}.

Readings:

• PEP 498 Literal String Interpolation
• Python String Formatting