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pythonjinja2

How to convert a integer to ordinal string in python jinja templates

I want to replace 1 with 1st, 2 with 2nd, and so on, in the jinja template.

Currently, I'm using the following code, but it is throwing SyntaxError

{{ "%d%s"% (no_of_owners, "tsnrhtdd"[(no_of_owners|int//10%10!=1) * (no_of_owners|int%10<4) * no_of_owners|int%10 :: 4]) }}

where no_of_owners is a string like "5". What should be the correct way to achieve this result?

Solution

  • The error seems pretty clear:

    TypeError: %d format: a real number is required, not str

    You're trying to format a string using %d, which doesn't make any sense. You could simply replace it with %s:

    >>> t = jinja2.Template('''{{ "%s%s"% (no_of_owners, "tsnrhtdd"[(no_of_owners|int//10%10!=1) * (no_of_owners|int%10<4) * no_of_owners|int%10 :: 4]) }}''')
>>> print(t.render(no_of_owners="5"))
5th

    Or add the int filter:

    >>> t = jinja2.Template('''{{ "%d%s"% (no_of_owners|int, "tsnrhtdd"[(no_of_owners|int//10%10!=1) * (no_of_owners|int%10<4) * no_of_owners|int%10 :: 4]) }}''')
>>> print(t.render(no_of_owners="5"))
5th

    Update 1

    Here's a runnable version of the above examples:

    import jinja2

print("=== using %s instead of %d ===")
t = jinja2.Template('''{{ "%s%s"% (no_of_owners, "tsnrhtdd"[(no_of_owners|int//10%10!=1) * (no_of_owners|int%10<4) * no_of_owners|int%10 :: 4]) }}''')
print(t.render(no_of_owners="5"))
print()

print("=== using int filter ===")
t = jinja2.Template('''{{ "%d%s"% (no_of_owners|int, "tsnrhtdd"[(no_of_owners|int//10%10!=1) * (no_of_owners|int%10<4) * no_of_owners|int%10 :: 4]) }}''')
print(t.render(no_of_owners="5"))
print()

    I'm testing this using Jinja2 3.0.3 and Python 3.11.

    Update 2

    The above code also works with Python 3.6 and Jinja2 2.10.1:

    $ python
Python 3.6.15 (default, Dec 21 2021, 12:03:22)
[GCC 10.2.1 20210110] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> import jinja2
>>> jinja2.__version__
'2.10.1'
>>> t = jinja2.Template('''{{ "%s%s"% (no_of_owners, "tsnrhtdd"[(no_of_owners|int//10%10!=1) * (no_of_owners|int%10<4) * no_of_owners|int%10 :: 4]) }}''')
>>> print(t.render(no_of_owners="5"))
5th
>>> t = jinja2.Template('''{{ "%d%s"% (no_of_owners|int, "tsnrhtdd"[(no_of_owners|int//10%10!=1) * (no_of_owners|int%10<4) * no_of_owners|int%10 :: 4]) }}''')
>>> print(t.render(no_of_owners="5"))
5th