f-string

I want to use f-string with my string variable, not with string defined with a string literal, "..." . here is my code name=["deep","mahesh","nirbhay"] user_input = r"certi_{element}" # this string i ask from user for element in name: print(f"{user_input}") This code gives output: certi_{element} certi_{element} certi_{element} But I want: certi_{deep} certi_{mahesh} certi_{nirbhay} how can I do this? f"..." strings are great when interpolating expression results into a literal , but you don't have a literal, you have a template string in a separate variable. You can use str.format() to apply

I would like to know how to format this case in a Pythonic way with f-strings: names = ['Adam', 'Bob', 'Cyril'] text = f"Winners are:\n{'\n'.join(names)}" print(text) The problem is that '\' cannot be used inside the {...} expression portions of an f-string. Expected output: Winners are: Adam Bob Cyril You can't. Backslashes cannot appear inside the curly braces {} ; doing so results in a SyntaxError : >>> f'{\}' SyntaxError: f-string expression part cannot include a backslash This is specified in the PEP for f-strings: Backslashes may not appear inside the expression portions of f-strings, [.

This question already has an answer here: How can I print literal curly-brace characters in python string and also use .format on it? 10 answers I have a string in which I would like curly-brackets, but also take advantage of the f-strings feature. Is there some syntax that works for this? Here are two ways it does not work. I would like to include the literal text " {bar} " as part of the string. foo = "test" fstring = f"{foo} {bar}" NameError: name 'bar' is not defined fstring = f"{foo} \{bar\}" SyntaxError: f-string expression part cannot include a backslash Desired result: 'test {bar}'

I am getting an error message with my Atom reader here, where it is suggesting the first print.(f"message") is delivering an error: File "/Users/permanentmajority/Desktop/Coding/learnpythonbook.py", line 75 print(f"Let's talk about {my_name}.") ^ SyntaxError: invalid syntax [Finished in 0.077s] Code: my_name = 'Zed A. Shaw' my_age = 35 # not a lie my_height = 74 # inches my_weight = 180 #lbs my_eyes = 'Blue' my_teeth = 'White' my_hair = 'Brown' print(f"Let's talk about {my_name}.") print(f"He's {my_height} inches tall.") print(f"He's {my_weight} pounds heavy.") print("Actually that's not too

I am using template strings to generate some files and I love the conciseness of the new f-strings for this purpose, for reducing my previous template code from something like this: template_a = "The current name is {name}" names = ["foo", "bar"] for name in names: print (template_a.format(**locals())) Now I can do this, directly replacing variables: names = ["foo", "bar"] for name in names: print (f"The current name is {name}") However, sometimes it makes sense to have the template defined elsewhere -- higher up in the code, or imported from a file or something. This means the template is a

Thanks to David Beazley's tweet , I've recently found out that the new Python 3.6 f-strings can also be nested: >>> price = 478.23 >>> f"{f'${price:0.2f}':*>20s}" '*************$478.23' Or: >>> x = 42 >>> f'''-{f"""*{f"+{f'.{x}.'}+"}*"""}-''' '-*+.42.+*-' While I am surprised that this is possible, I am missing on how practical is that, when would nesting f-strings be useful? What use cases can this cover? Note: The PEP itself does not mention nesting f-strings, but there is a specific test case . I don't think formatted string literals allowing nesting (by nesting, I take it to mean f'{f".."}

I really like to delve into code style and it's interesting to know whether from now on in all cases it would be better to use the new style. I'm using a lot the .format() in my Python 3.5 projects, and I'm afraid that it will be deprecated during the next Python versions because of this new kind of string literals. >>> name = "Test" >>> f"My app name is {name}." 'My app name is Test.' Does the formatted string feature come to fully replace the old format() ? I understand that it based on the idea that: Simple is better than complex. However, what about performance issues, does any difference