Insert % signs in output python

Question

I am beginner of python and trying to insert percentage sign in the output. Below is the code that I've got.

print('accuracy :', accuracy_score(y_true, y_pred)*100)

when I run this code I got 50.0001 and I would like to have %sign at the end of the number so I tried to do as below

print('Macro average precision :', precision_score(y_true, y_pred, average='macro')*100"%\n")

I got error say SyntaxError: invalid syntax Can any one help with this?

Thank you!

You can use formatting `'Macro average precision : {:.0%}\n'.format(precision_score(y_true, y_pred, average='macro'))` — Olvin Roght, Apr 13 '20 at 07:45
The syntax error is because you simply concatenated a float expression with a character string; this is nonsense in Python. Vis. `print(50.001"%\n")`. — Prune, Apr 13 '20 at 07:49

score 1 · Answer 1 · edited Apr 13 '20 at 08:06

Use f strings:

print(f"Macro average precision : {precision_score(y_true, y_pred, average='macro')*100}%\n")

Or convert the value to string, and add (concatenate) the strings:

print('Macro average precision : ' + str(precision_score(y_true, y_pred, average='macro')*100) + "%\n")

See the discussion here of the merits of each; basically the first is more convenient; and the second is computationally faster, and perhaps more simple to understand.

score 0 · Answer 2 · edited Apr 13 '20 at 08:05

0

The simple, "low-tech" way is to correct your (lack of) output expression. Convert the float to a string and concatenate. To make it easy to follow:

pct = precision_score(y_true, y_pred, average='macro')*100
print('Macro average precision : ' + str(pct) + "%\n")

This is inelegant, but easy to follow.

edited Apr 13 '20 at 08:05

Olvin Roght

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answered Apr 13 '20 at 07:51

Prune

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score 0 · Answer 3 · answered Apr 13 '20 at 07:56

0

You can try this:

print('accuracy: {:.2f}%'.format(100*accuracy_score(y_true, y_pred)))

answered Apr 13 '20 at 07:56

libingallin

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score 0 · Answer 4 · edited Apr 13 '20 at 08:06

One of the ways to go about fixing this is by using string concatenation. You can add the percent symbol to your output from your function using a simple + operator. However, the output of your function needs to be cast to a string data type in order to be able to concatenate it with a string. To cast something to a string, use str()

So the correct way to fix your print statement using this explanation would be:

print('Macro average precision : ' + str(precision_score(y_true, y_pred, average='macro')*100) + "%\n")

Insert % signs in output python

4 Answers4