Python convert string to float

Question

I have a string that looks like this:

a = "'92.345'\r\n\r\n"
a.strip()

When I try to convert it into float using np.float(a) or just float(a), I get

*** Value error: could not convert string to float: '92.345'

How do I convert it cleanly to a float?

What do you think would \r or \n become when converted to a float? — TidB
– TidB, Commented Mar 23, 2015 at 20:15
It's probably worth noting that a.strip() on its own does nothing. You have to do something with the result, ex. a = a.strip() or x = float(a.strip()) or whatever. — Kevin
– Kevin, Commented Mar 23, 2015 at 20:20

Kasravnd · Accepted Answer · 2015-03-23 20:25:31Z

7

You need to strip your string to remove the whitespaces and one quote ':

>>> float(a.strip().strip("'"))
92.345

Or as @Martijn Pieters says in comment you can use use a.strip("\r\n\t '") to reduce this to one strip call.

edited Mar 23, 2015 at 20:25

answered Mar 23, 2015 at 20:15

Kasravnd

108k19 gold badges167 silver badges195 bronze badges

Sign up to request clarification or add additional context in comments.

1 Comment

Martijn Pieters Over a year ago

or use a.strip("\r\n\t '") to reduce this to one strip call.

Padraic Cunningham · Accepted Answer · 2015-03-23 20:29:54Z

2

You can also use str.translate:

print(float(a.translate(None,"\r\n'")))

answered Mar 23, 2015 at 20:29

Padraic Cunningham

181k30 gold badges264 silver badges327 bronze badges

Comments

Kasravnd · Accepted Answer · 2015-03-23 20:20:09Z

1

Try slicing the string to extract only the digit part of it:

a = "'92.345'\r\n\r\n"
x = float(a[1:6])

edited Mar 23, 2015 at 20:20

Kasravnd

108k19 gold badges167 silver badges195 bronze badges

answered Mar 23, 2015 at 20:16

NevDev

6045 silver badges8 bronze badges

1 Comment

Zizouz212 Over a year ago

The only issue with this is it can't do it again and again, you need to know what you are slicing before hand.

Heisenberg · Accepted Answer · 2015-03-23 20:30:59Z

1

Remove everything but digit and dot

>>> a = "'92.345123'\r\n\r\n"
>>> float(re.sub(r'[^0-9\.]', '', a))
92.345123

answered Mar 23, 2015 at 20:30

Heisenberg

1,5083 gold badges19 silver badges36 bronze badges

Collectives™ on Stack Overflow

Python convert string to float

4 Answers 4

1 Comment

Comments

1 Comment

Comments

Your Answer

Linked

Hot Network Questions

Collectives™ on Stack Overflow

4 Answers 4

1 Comment

Comments

1 Comment

Comments

Your Answer

Sign up or log in

Post as a guest

Linked

Related