MicroPython Forum (Archive)

Posted: **Thu Feb 17, 2022 6:47 am**

I was looking at print formatting with MicroPython and RP2.

Specifically I was trying to use:

print("foo".ljust(50))

I was unable to do thing because the REPL reports that there is no method ljust for str.

And, sure enough, in MicroPython 1.18 ljust (and rjust) do not exist as methods to str.

Code: Select all

help ("foo")
object foo is of type str
  encode -- <function>
  find -- <function>
  rfind -- <function>
  index -- <function>
  rindex -- <function>
  join -- <function>
  split -- <function>
  splitlines -- <function>
  rsplit -- <function>
  startswith -- <function>
  endswith -- <function>
  strip -- <function>
  lstrip -- <function>
  rstrip -- <function>
  format -- <function>
  replace -- <function>
  count -- <function>
  partition -- <function>
  rpartition -- <function>
  center -- <function>
  lower -- <function>
  upper -- <function>
  isspace -- <function>
  isalpha -- <function>
  isdigit -- <function>
  isupper -- <function>
  islower -- <function>

Why is there no ljust or rjust, when it is shown as examples to use for formatting?

Posted: **Thu Feb 17, 2022 7:04 am**

Perhaps you were looking at CPython examples?

MicroPython indeed does not implement those functions: http://docs.micropython.org/en/latest/g ... s.html#str

Posted: **Thu Feb 17, 2022 9:08 am**

So write your own:

Code: Select all

def rjust(s, n):
    return "".join((" "*(n - len(s)), s))
print(rjust("foo", 50))
                                               foo

Or as a one-liner

Code: Select all

ljust = lambda s, n : "".join((s, " "*(n - len(s))))

Posted: **Thu Feb 17, 2022 10:27 pm**

Code: Select all

print(f'{"foo":<50s}')

Posted: **Fri Feb 18, 2022 12:29 pm**

Much better

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