How to solve this Python string interpolate related?

Question

I'm required to do a python quiz.

here is question:

Your challenge here is to write a function format_point that returns a string representing a point in 2-space. The function takes three parameters. The first two are floating point numbers representing the x and y coordinates of a point and the third parameter is an integer specifying the required number of digits after the decimal point. The returned string is of the form "(23.176, 19.235)". For example, the following three lines of code should print the output (0.67, 17.12).

What I did was:

>>> def coordinate(x,y,n): ... str_x = format(x,"."+n+"f") ... str_y = format(y,"."+n+"f") ... print("("+str_x+","+str_y+")") ... >>> coordinate(10.242,53.124,2)

I got the error:

Traceback (most recent call last): File "<stdin>", line 1, in <module> File "<stdin>", line 2, in coordinate TypeError: cannot concatenate 'str' and 'int' objects

Where I did wrong?

As this looks like homework I won't give an answer, but check out type-casting in Python. — adchilds
– adchilds, Commented Aug 2, 2012 at 2:44
look at string formatting its typically "<SomeFormatString>".format(arg1,arg2,...) — Joran Beasley
– Joran Beasley, Commented Aug 2, 2012 at 2:54

xiaowl · Accepted Answer · 2012-08-02 02:43:02Z

3

cannot concatenate 'str' and 'int' objects

Try

format(str(x), "." + str(n) + "f")

or

format(str(x), ".%sf" % n)

answered Aug 2, 2012 at 2:43

xiaowl

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2 Comments

mko Over a year ago

Now It works! BTW your 2nd solution is pretty cool, could you give me some resource about it?

xiaowl Over a year ago

@yozloy check this docs.python.org/library/string.html#format-string-syntax

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