what does the letter 'f' do here?

Question

This is the piece of code here. It deals with the data analysis of the avocado prices dataset avaialble on kaggle using pandas.

graph_df = pd.DataFrame
for r in regions:
  r_df = df.copy()[df['region']==r]
  r_df.set_index("Date", inplace=True)
  r_df.sort_index(inplace=True)
  r_df[f"{r}_25MA"] = r_df['AveragePrice'].rolling(25).mean()

  if graph_df.empty:
    graph_df = r_df[[f"{r}_25MA"]]
  else:
    graph_df = graph_df.join(r_df[f"{r}_25MA"])

graph_df.tail()

what i want to know is what does the letter 'f' before {r}_25MA do in this

r_df[f"{r}_25MA"] = r_df['AveragePrice'].rolling(25).mean()

  if graph_df.empty:
    graph_df = r_df[[f"{r}_25MA"]]
  else:
    graph_df = graph_df.join(r_df[f"{r}_25MA"])

if anybody knows please do help and sorry for asking a noob question.

It's [string interpolation](https://docs.python.org/3/whatsnew/3.6.html#whatsnew36-pep498) also called `f-string`s. — Sean Vieira, Aug 05 '20 at 12:43

score 0 · Answer 1 · edited Aug 05 '20 at 12:43

0

f-strings are a great new way to format strings. For example:

text = "is text"
print(f"This {text}")

edited Aug 05 '20 at 12:43

jonrsharpe

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answered Aug 05 '20 at 12:43

Aryasatya

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Hey thanks. i actually used .format and didn't knew about this thanks for the answer :) – Sparsh Tiwari Aug 05 '20 at 12:59

what does the letter 'f' do here?

1 Answers1