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Questions tagged [f-string]

Literal string interpolation in Python

An f-string is the abbreviated name for a "formatted string" syntax that was introduced in Python 3.6 and extended in Python 3.7. They enable literal string interpolation: 

>>> value = 80
>>> f'The value is {value}.'
'The value is 80.'

See PEP 498 for a comprehensive description of the feature, and also PEP 536 for the final grammar.

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How to store the result of a print function () into a variable to include it in a f string

I have the following dataframe: data={'Process_ID':['12345-98', '23547-75', '85763-99','44231-56','78456-00','53218-87'], 'Date': ['2021-06-30','2022-08-10','2021-06-15','2023-10-02','2024-04-03','2021-06-25'], 'Check':…
programmer987
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What does the colon and the dot in a print statement mean?

What are . and : doing in a print statement? For example: print(f'The estimated revenue for a $350 film is around ${revenue_estimate:.10}.') this returns : The estimated revenue for a $350 film is around $600000000.0. But without : and . the…
Ali
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python sqlite query selecting text padded with multiple zeros

I had trouble with selecting TEXT data type padded with zeros in front. Found out there's something wrong with my DB. My multiple tries and all of answers by peers should all should work. Thanks @snakecharmerb and @forpas for pointing out for…
hyukkyulee
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Assertion Error when Error Strings Match in UnitTest?

A class I've made takes in a variable to represent a point in 3D space, e.g. point = [x, y, z], I check that this point is the correct length to make sure it's 3D and throw an Error if it's not: if len(point) != 3: raise ValueError(f"Point:…
Connor
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How to read string from a file that contains placeholders for variables and add it to the code and then send an email?

I have a text file called email_body.txt and it has the following data: email_body.txt: Dear {b}, Hope all your queries were resolved in your recent consultation with Dr. XXXXXXXXXXXXX on: {e} Your prescription is attached herewith. Wishing you a…
Deven Jain
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How do I give multiple arguments(width, sigh, grouping) in Python format string mini-language?

I read format string mini-language from Python doc and tried to do this: a = 20000 # I want "+20,000.00 " for the result print(f"a:+,.2f") # >> +20,000.00 print(f"{a:<20+,.2f}") # >> ValueError: Invalid format specifier print(f"{a:<20,.2f}")…
user8491363
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How to refer to columns containing f-strings in a Pyspark function?

I am writing a function for a Spark DF that performs operations on columns and gives them a suffix, such that I can run the function twice on two different suffixes and join them later. I am having a time of figuring out the best way to refer to…
user
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How to align text in Python using variables rather than direct input?

I am trying to write a function which takes 6 inputs, a first and last name, two alignment characters and two lengths for alignment. The function is supposed to display the names using the alignment variables like so: |First name | Last name| |John…
FrankYaygrrr
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Python f'strings

Suppose I write a line in python as: result_string = f"panel_index_numbers={(','.join(str(n) for n in panel_index_numbers).replace(',', ':'))}" How can I write without errors by separating the datas inside the curly braces in two different…
sriyam
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F string is adding new line

I am trying to make a name generator. I am using F string to concatenate the first and the last names. But instead of getting them together, I am getting them in a new line. print(f"Random Name Generated…
Jayit Ghosh
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DotMap with a variable named from receives unexpected EOF while parsing

The code below will not execute because the fstring error. Is from a reserved word in dotmap ? from dotmap import DotMap oWithFrom = {"from":"from Data", "to":"to Data"} dmWithFrom =…
Bikeaccdnt
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Try to both format and align numbers in a table using f-string

I'm trying to print a simple table with 3 columns: Date, Market Return, and Final value. I'm having a hard time getting the syntax correct to both align a column right or left AND format a number - as decimal or percent: import numpy as np import…
whartonone
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How to format decimal to string as part of @hybrid_property.expression?

Problem I want to create a hybrid property which is composed of a string and a decimal formatted as percentage string but I am getting a TypeError. I've tried several variations on the f-string including converting it to float first but I still get…
aik3e
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SQL query f string formatting in Python script

I have been trying to apply an f string formatting for the colname parameter inside the SQL query for a script I am building, but I keep getting a parse exception error. def expect_primary_key_have_relevant_foreign_key(spark_df1, spark_df2,…
Luigi
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Accessing individual values from one key (dictionary)

people = {"Jenn" : ['renter', 'large room'], "Lana" : ['renter', 'small room'], "Ricky" :['owner', 'large room'] } Is there a way to access each individual value for a given key via for loop to print the stats of…
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