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9580 :: nimporter.NimCompileException: The system cannot find the file specified.

• bjorn_madsen (orginal) [2022-11-06T18:21:33+01:00] view original

  Hi - I've got a single starting problem:

  
  nimporter.NimCompileException: Error: unhandled exception: The system cannot find the file specified.
  Run

  The source is the tutorial from statch, which suggests takes 3 steps to compare python and nim, but as you see I have run into this error:

  
  nimporter.NimCompileException: Error: unhandled exception: The system cannot find the file specified.
  Run

  The tutorial creates these 3 files in the same folder:

  main.py

  import nimporter
  from time import perf_counter
  
  import nmath  # Nim imports!
  import pmath
  
  
  print("Measuring python...")
  start_py = perf_counter()
  for i in range(0,40):
      print(pmath.fib(i))
  end_py = perf_counter()
  
  print("Measuring Nim...")
  start_nim = perf_counter()
  for i in range(0,40):
      print(nmath.fib(i))
  end_nim = perf_counter()
  
  print("--------------")
  print("Python elapsed", end_py-start_py)
  print("Nim elapsed", end_nim-start_nim)
  Run

  pmath.py

  def fib(n):
      if n==0:
          return 0
      elif n<3:
          return 1
      return fib(n-1) + fib(n-2)
  Run

  nmath.nim

  import nimpy
  
  proc fib(n: int): int {.exportpy.} =
      if n==0:
          return 0
      elif n<3:
          return 1
      return fib(n-1) + fib(n-1)
  Run

  When running main.py I get the following error:

  
  (pages310) D:\github\nim_test>C:/Data/venv/pages310/Scripts/python.exe d:/github/nim_test/main.py
  Traceback (most recent call last):
    File "d:\github\nim_test\main.py", line 5, in <module>
      import nmath  # Nim imports!
    File "<frozen importlib._bootstrap>", line 1027, in _find_and_load
    File "<frozen importlib._bootstrap>", line 1002, in _find_and_load_unlocked
    File "<frozen importlib._bootstrap>", line 945, in _find_spec
    File "C:\Data\venv\pages310\lib\site-packages\nimporter.py", line 1269, in find_spec
      return Nimporter.import_nim_code(fullname, path, library=False)
    File "C:\Data\venv\pages310\lib\site-packages\nimporter.py", line 944, in import_nim_code
      NimCompiler.compile_nim_code(
    File "C:\Data\venv\pages310\lib\site-packages\nimporter.py", line 705, in compile_nim_code
      cls.check_compile_errors(errors, library, nim_args, output, tmp_cwd, warnings)
    File "C:\Data\venv\pages310\lib\site-packages\nimporter.py", line 492, in check_compile_errors
      raise NimCompileException(errors[0])
  nimporter.NimCompileException: Error: unhandled exception: The system cannot find the file specified.
  Run

  Things that work:

  • I'm on windows 10 enterprise and installed nim yesterday.
  • I'm in VScode and can compile the nmath.nim with F6 with this result:

  
  D:\github\nim_test>nim c -r "d:\github\nim_test\nmath.nim"
  Hint: used config file 'C:\Users\madsenbj\Downloads\nim-1.6.8_x64\nim-1.6.8\config\nim.cfg' [Conf]
  Hint: used config file 'C:\Users\madsenbj\Downloads\nim-1.6.8_x64\nim-1.6.8\config\config.nims' [Conf]
  ........................................................................................................
  C:\Users\madsenbj\.nimble\pkgs\nimpy-0.2.0\nimpy.nim(761, 25) Hint: 'fibPy_wrapper' should be: 'fibPyWrapper' [Name]
  CC: C:/Users/madsenbj/Downloads/nim-1.6.8_x64/nim-1.6.8/lib/system/ansi_c.nim
  CC: C:/Users/madsenbj/Downloads/nim-1.6.8_x64/nim-1.6.8/lib/std/private/digitsutils.nim
  CC: C:/Users/madsenbj/Downloads/nim-1.6.8_x64/nim-1.6.8/lib/system/assertions.nim
  CC: C:/Users/madsenbj/Downloads/nim-1.6.8_x64/nim-1.6.8/lib/system/dollars.nim
  CC: C:/Users/madsenbj/Downloads/nim-1.6.8_x64/nim-1.6.8/lib/system/io.nim
  CC: C:/Users/madsenbj/Downloads/nim-1.6.8_x64/nim-1.6.8/lib/system.nim
  CC: C:/Users/madsenbj/Downloads/nim-1.6.8_x64/nim-1.6.8/lib/pure/strutils.nim
  CC: C:/Users/madsenbj/Downloads/nim-1.6.8_x64/nim-1.6.8/lib/pure/dynlib.nim
  CC: C:/Users/madsenbj/Downloads/nim-1.6.8_x64/nim-1.6.8/lib/windows/winlean.nim
  CC: C:/Users/madsenbj/Downloads/nim-1.6.8_x64/nim-1.6.8/lib/pure/times.nim
  CC: C:/Users/madsenbj/Downloads/nim-1.6.8_x64/nim-1.6.8/lib/std/private/win_setenv.nim
  CC: C:/Users/madsenbj/Downloads/nim-1.6.8_x64/nim-1.6.8/lib/pure/os.nim
  CC: C:/Users/madsenbj/.nimble/pkgs/nimpy-0.2.0/nimpy/py_types.nim
  CC: C:/Users/madsenbj/.nimble/pkgs/nimpy-0.2.0/nimpy/py_lib.nim
  CC: C:/Users/madsenbj/.nimble/pkgs/nimpy-0.2.0/nimpy/py_utils.nim
  CC: C:/Users/madsenbj/.nimble/pkgs/nimpy-0.2.0/nimpy/py_nim_marshalling.nim
  CC: C:/Users/madsenbj/.nimble/pkgs/nimpy-0.2.0/nimpy.nim
  CC: nmath.nim
  Hint:  [Link]
  Hint: gc: refc; opt: none (DEBUG BUILD, `-d:release` generates faster code)
  59578 lines; 2.133s; 93.648MiB peakmem; proj: d:\github\nim_test\nmath.nim; out: d:\github\nim_test\nmath.exe [SuccessX]
  Hint: d:\github\nim_test\nmath.exe  [Exec]
  Run

  pip freeze reveals nimporter==1.1.0

  I'm on python 3.10.8

  and

  >nim shows:

  
  D:\github\nim_test>nim
  Nim Compiler Version 1.6.8 [Windows: amd64]
  Compiled at 2022-09-27
  Run

  What could I be missing?

  Kind regards Bjorn

---

• Araq (orginal) [2022-11-06T20:41:38+01:00] view original

  I cannot help you with nimporter but you don't need Python interop just for a simple benchmark of fib. There are plenty of packages available for benchmarking or you can use the stdlib's "monotimes.nim".

---

• bjorn_madsen (orginal) [2022-11-06T21:15:57+01:00] view original

  Thank you for the quick response @Araq.

  I chose the tutorial because of its relevance for other tasks I need to solve from python.

---

• bjorn_madsen (orginal) [2022-11-06T23:54:01+01:00] view original

  I have found the answer on nimpy under the headline of:

  "implementing a Python Module in Nim" hinted subtly as:

  
  # Compile on Windows:
  nim c --app:lib --out:mymodule.pyd --threads:on --tlsEmulation:off --passL:-static mymodule
  # Compile on everything else:
  nim c --app:lib --out:mymodule.so --threads:on mymodule
  Run

  So the error was that nmath.pyd couldn't be found as I had not compiled the python binary.

  By running:

  
  nim c --app:lib --out:nmath.pyd --threads:on --tlsEmulation:off --passL:-static nmath
  Run

  The nmath.pyd file was created with:

  
  (pages310) D:\github\nim_test>nim c --app:lib --out:nmath.pyd --threads:on --tlsEmulation:off --passL:-static nmath
  Hint: used config file 'C:\Users\madsenbj\Downloads\nim-1.6.8_x64\nim-1.6.8\config\nim.cfg' [Conf]
  Hint: used config file 'C:\Users\madsenbj\Downloads\nim-1.6.8_x64\nim-1.6.8\config\config.nims' [Conf]
  ................................................................................................................
  C:\Users\madsenbj\.nimble\pkgs\nimpy-0.2.0\nimpy.nim(761, 25) Hint: 'fibPy_wrapper' should be: 'fibPyWrapper' [Name]
  CC: C:/Users/madsenbj/Downloads/nim-1.6.8_x64/nim-1.6.8/lib/system/ansi_c.nim
  CC: C:/Users/madsenbj/Downloads/nim-1.6.8_x64/nim-1.6.8/lib/std/private/digitsutils.nim
  CC: C:/Users/madsenbj/Downloads/nim-1.6.8_x64/nim-1.6.8/lib/system/assertions.nim
  CC: C:/Users/madsenbj/Downloads/nim-1.6.8_x64/nim-1.6.8/lib/system/dollars.nim
  CC: C:/Users/madsenbj/Downloads/nim-1.6.8_x64/nim-1.6.8/lib/pure/collections/sharedlist.nim
  CC: C:/Users/madsenbj/Downloads/nim-1.6.8_x64/nim-1.6.8/lib/system/io.nim
  CC: C:/Users/madsenbj/Downloads/nim-1.6.8_x64/nim-1.6.8/lib/system.nim
  CC: C:/Users/madsenbj/Downloads/nim-1.6.8_x64/nim-1.6.8/lib/pure/strutils.nim
  CC: C:/Users/madsenbj/Downloads/nim-1.6.8_x64/nim-1.6.8/lib/pure/dynlib.nim
  CC: C:/Users/madsenbj/Downloads/nim-1.6.8_x64/nim-1.6.8/lib/windows/winlean.nim
  CC: C:/Users/madsenbj/Downloads/nim-1.6.8_x64/nim-1.6.8/lib/pure/times.nim
  CC: C:/Users/madsenbj/Downloads/nim-1.6.8_x64/nim-1.6.8/lib/std/private/win_setenv.nim
  CC: C:/Users/madsenbj/Downloads/nim-1.6.8_x64/nim-1.6.8/lib/pure/os.nim
  CC: C:/Users/madsenbj/.nimble/pkgs/nimpy-0.2.0/nimpy/py_types.nim
  CC: C:/Users/madsenbj/.nimble/pkgs/nimpy-0.2.0/nimpy/py_lib.nim
  CC: C:/Users/madsenbj/.nimble/pkgs/nimpy-0.2.0/nimpy/py_utils.nim
  CC: C:/Users/madsenbj/.nimble/pkgs/nimpy-0.2.0/nimpy/py_nim_marshalling.nim
  CC: C:/Users/madsenbj/.nimble/pkgs/nimpy-0.2.0/nimpy.nim
  CC: nmath.nim
  Hint:  [Link]
  Hint: gc: refc; threads: on; opt: none (DEBUG BUILD, `-d:release` generates faster code)
  61670 lines; 4.686s; 93.723MiB peakmem; proj: nmath; out: D:\github\nim_test\nmath.pyd [SuccessX]
  Run

  I'm not sure (yet) on how to read the compiler instructions, but I will get there eventually.

  At least my program runs, and I can only thank the nim-team that I've achieved more progress in 2 days with nim that in a month with Julia.

---