Reading the documentation

[Nathan Ernst]

You passed a string to "math.floor", not anything resembling a numeric
type. Try using an actual float, int or Decimal:

Python 3.5.2 (default, Nov 17 2016, 17:05:23)
[GCC 5.4.0 20160609] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> from math import floor
>>> from decimal import Decimal
>>> floor("2.3")
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
TypeError: a float is required

>>> floor(2.3)
2

>>> floor(Decimal("2.3"))
2

>>> floor(2)
2

Remember that Python is strongly typed; you do not get automatic type
conversions from strings to numeric types such as in Perl.

Regards,
Nathan

On Thu, Aug 24, 2017 at 2:24 PM, Stefan Ram <ram at zedat.fu-berlin.de> wrote:

>   This is a transcript:
>
> >>> from math import floor
> >>> floor( "2.3" )
> Traceback (most recent call last):
>   File "<stdin>", line 1, in <module>
> TypeError: must be real number, not str
> >>> help(floor)
> Help on built-in function floor in module math:
>
> floor(...)
>     floor(x)
>
>     Return the floor of x as an Integral.
>     This is the largest integer <= x.
>
>   Is the output of »help(floor)« supposed to be a kind of
>   normative documentation, i.e., /the/ authoritative
>   documentation of »floor«?
>
>   Is there any hint in the documentation about the type
>   expected of arguments in a call?
>
>   Is a parameter name »x« (as used above) described
>   somewhere to express the requirement of a real number?
>
>   It seems, »real« means »int or float«. Is this meaning
>   of »real« documented somewhere?
>
>   Thanks in advance!
>
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>