Szathmáry László honlapja @ DEIK | Nim2 / How to import a package

Importing is very similar to Python.

Import just some parts of a package

The following code drops an error:

# read a line of words from stdin and print the first word reversed
import std/strutils
import std/unicode # reversed

let parts = stdin.readLine.splitWhitespace
echo parts[0].reversed

Error message:

main.nim(9, 27) Error: ambiguous call; both strutils.splitWhitespace(s: string, maxsplit: int) 
[func declared in /home/jabba/.choosenim/toolchains/nim-2.4.0/lib/pure/strutils.nim(924, 6)] and 
unicode.splitWhitespace(s: string) [proc declared in 
/home/jabba/.choosenim/toolchains/nim-2.4.0/lib/pure/unicode.nim(1464, 6)] match for: (string)

The error comes from std/unicode and std/strutils both exporting a splitWhitespace for string, so the compiler can’t pick one.

Solution #1

From the package unicode I only need the function reversed. So it'd be enough to import only that function:

import std/strutils
from std/unicode import reversed

let parts = stdin.readLine.splitWhitespace
echo parts[0].reversed

Solution #2

To avoid ambiguity, we can qualify the call explicitly:

import std/strutils
import std/unicode

let parts = strutils.splitWhitespace(stdin.readLine)
echo parts[0].reversed

Here it's clear which splitWhitespace() we want to call.