Feature request: Support str(<int>) and more generally str.

[ghost]

This is my python code:

import random
#         A B C D E F G H K J
myList = [0,1,2,3,4,5,6,7,8,9]

def scramble(aList):
  while True:
    randomlist = []
    newList = []
    length = len(aList)
    while length!=len(randomlist):
      rand = random.randint(0, length-1)
      if rand not in randomlist:
        randomlist.append(rand)
    for i in range(len(aList)):
      newList.append(aList[randomlist[i]])
    myList = newList
    GHF = (myList[6]*100 + myList[7]*10 +myList[5])
    JEF = (myList[9]*100 + myList[4]*10 +myList[5])
    AJF = (myList[0]*100 + myList[9]*10 +myList[5])
    JDE = (myList[9]*100 + myList[3]*10 +myList[4])*10
    FBD = (myList[5]*100 + myList[1]*10 +myList[3])*100
    add = (FBD+JDE+AJF)
    FCAKF= int(str(myList[5])+str(myList[2])+str(myList[0])+str(myList[8])+str(myList[5]))
    if (JEF*GHF)==FCAKF and len(str(JEF))==len(str(GHF))==3 and add==FCAKF:
      print('  ',GHF)
      print(' X',JEF)
      print('---------')
      print('  ',AJF)
      print(' ',JDE)
      print('',FBD)
      print('',FCAKF)
      break
scramble(myList)

====================================================================

This is the error:

Traceback (most recent call last):
  File "/Users/m3hdi/Documents/Python3/numba_test.py", line 38, in <module>
    scramble(myList)
  File "/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages/numba/dispatcher.py", line 376, in _compile_for_args
    error_rewrite(e, 'typing')
  File "/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages/numba/dispatcher.py", line 343, in error_rewrite
    reraise(type(e), e, None)
  File "/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages/numba/six.py", line 658, in reraise
    raise value.with_traceback(tb)
numba.errors.TypingError: Failed in nopython mode pipeline (step: nopython frontend)
Untyped global name 'str': cannot determine Numba type of <class 'type'>

File "Documents/Python3/numba_puzzle.py", line 26:
def scramble(aList):
    <source elided>
    add = (FBD+JDE+AJF)
    FCAKF= int(str(myList[5])+str(myList[2])+str(myList[0])+str(myList[8])+str(myList[5]))
    ^

This is not usually a problem with Numba itself but instead often caused by
the use of unsupported features or an issue in resolving types.

To see Python/NumPy features supported by the latest release of Numba visit:
http://numba.pydata.org/numba-doc/latest/reference/pysupported.html
and
http://numba.pydata.org/numba-doc/latest/reference/numpysupported.html

For more information about typing errors and how to debug them visit:
http://numba.pydata.org/numba-doc/latest/user/troubleshoot.html#my-code-doesn-t-compile

If you think your code should work with Numba, please report the error message
and traceback, along with a minimal reproducer at:
https://github.com/numba/numba/issues/new

[stuartarchibald]

Thanks for the report.

RE formatting in GitHub issues, for future reference triple backticks are needed around a code block (with optional language syntax specified), for example: ```python <your code> ```. GitHub also has a basic guide to its markdown syntax available here.

[stuartarchibald]

I've updated the issue with markdown syntax and changed the title to reflect what the issue is. Essentially Numba does not yet have support for str() as a method on constructing strings from any type at all, labelling this as a feature request.