For now, only one `pyodide` can be loaded in a given global scope because we need to use a global variable for package loading. This changes `loadPyodide` so that it no longer defines `globalThis.pyodide` in favor of just returning `pyodide` from `loadPyodide`. `Module` is placed on the global object as `globalThis.__pyodide_module` for the purposes of package loading. I added documentation to explicitly state that `loadPyodide` can only be run once in each global Javascript context, an error will be thrown otherwise.

This has two advantages: 
1. The returned `pyodide` module is understandable to Typescript and other code analysis, whereas the global variable is not understandable.
2. If in the future we are able to remove the global variable, no further API change will be needed (other than relaxing the documented "pyodide must be globally-unique" constraint). I figure it's better to make this API change earlier rather than later.

It will be possible to completely remove the global variable dependence when Firefox implements support for using ES6 modules in webworkers (see https://bugzilla.mozilla.org/show_bug.cgi?id=1247687).
API Don't expose pyodide as a global variable in loadPyodide. For now, only one `pyodide` can be loaded in a given global scope because we need to use a global variable for package loading. This changes `loadPyodide` so that it no longer defines `globalThis.pyodide` in favor of just returning `pyodide` from `loadPyodide`. `Module` is placed on the global object as `globalThis.__pyodide_module` for the purposes of package loading. I added documentation to explicitly state that `loadPyodide` can only be run once in each global Javascript context, an error will be thrown otherwise.

This has two advantages: 
1. The returned `pyodide` module is understandable to Typescript and other code analysis, whereas the global variable is not understandable.
2. If in the future we are able to remove the global variable, no further API change will be needed (other than relaxing the documented "pyodide must be globally-unique" constraint). I figure it's better to make this API change earlier rather than later.

It will be possible to completely remove the global variable dependence when Firefox implements support for using ES6 modules in webworkers (see https://bugzilla.mozilla.org/show_bug.cgi?id=1247687).
#! /usr/bin/env python
# -*- coding: utf-8 -*-
# flake8: noqa

"""
"PYSTONE" Benchmark Program

Version:        Python/1.1 (corresponds to C/1.1 plus 2 Pystone fixes)

Author:         Reinhold P. Weicker,  CACM Vol 27, No 10, 10/84 pg. 1013.

                Translated from ADA to C by Rick Richardson.
                Every method to preserve ADA-likeness has been used,
                at the expense of C-ness.

                Translated from C to Python by Guido van Rossum.

Version History:
                Fix Python 3.8 compatibility by replacing time.clock
                with time.perf_counter

                Inofficial version 1.1.1 by Chris Arndt:

                - Make it run under Python 2 and 3 by using
                  "from __future__ import print_function".
                - Change interpreter name in shebang line to plain
                  "python".
                - Add source code encoding declaration.

                Version 1.1 corrects two bugs in version 1.0:

                First, it leaked memory: in Proc1(), NextRecord ends
                up having a pointer to itself.  I have corrected this
                by zapping NextRecord.PtrComp at the end of Proc1().

                Second, Proc3() used the operator != to compare a
                record to None.  This is rather inefficient and not
                true to the intention of the original benchmark (where
                a pointer comparison to None is intended; the !=
                operator attempts to find a method __cmp__ to do value
                comparison of the record).  Version 1.1 runs 5-10
                percent faster than version 1.0, so benchmark figures
                of different versions can't be compared directly.

"""

from __future__ import print_function

LOOPS = 50000

from time import perf_counter

__version__ = "1.1.1"

[Ident1, Ident2, Ident3, Ident4, Ident5] = range(1, 6)


class Record:
    def __init__(self, PtrComp=None, Discr=0, EnumComp=0, IntComp=0, StringComp=0):
        self.PtrComp = PtrComp
        self.Discr = Discr
        self.EnumComp = EnumComp
        self.IntComp = IntComp
        self.StringComp = StringComp

    def copy(self):
        return Record(
            self.PtrComp, self.Discr, self.EnumComp, self.IntComp, self.StringComp
        )


TRUE = 1
FALSE = 0


def main(loops=LOOPS):
    benchtime, stones = pystones(loops)
    print("%g" % benchtime)


def pystones(loops=LOOPS):
    return Proc0(loops)


IntGlob = 0
BoolGlob = FALSE
Char1Glob = "\0"
Char2Glob = "\0"
Array1Glob = [0] * 51
Array2Glob = [x[:] for x in [Array1Glob] * 51]
PtrGlb = None
PtrGlbNext = None


def Proc0(loops=LOOPS):
    global IntGlob
    global BoolGlob
    global Char1Glob
    global Char2Glob
    global Array1Glob
    global Array2Glob
    global PtrGlb
    global PtrGlbNext

    starttime = perf_counter()
    for i in range(loops):
        pass
    nulltime = perf_counter() - starttime

    PtrGlbNext = Record()
    PtrGlb = Record()
    PtrGlb.PtrComp = PtrGlbNext
    PtrGlb.Discr = Ident1
    PtrGlb.EnumComp = Ident3
    PtrGlb.IntComp = 40
    PtrGlb.StringComp = "DHRYSTONE PROGRAM, SOME STRING"
    String1Loc = "DHRYSTONE PROGRAM, 1'ST STRING"
    Array2Glob[8][7] = 10

    starttime = perf_counter()

    for i in range(loops):
        Proc5()
        Proc4()
        IntLoc1 = 2
        IntLoc2 = 3
        String2Loc = "DHRYSTONE PROGRAM, 2'ND STRING"
        EnumLoc = Ident2
        BoolGlob = not Func2(String1Loc, String2Loc)
        while IntLoc1 < IntLoc2:
            IntLoc3 = 5 * IntLoc1 - IntLoc2
            IntLoc3 = Proc7(IntLoc1, IntLoc2)
            IntLoc1 = IntLoc1 + 1
        Proc8(Array1Glob, Array2Glob, IntLoc1, IntLoc3)
        PtrGlb = Proc1(PtrGlb)
        CharIndex = "A"
        while CharIndex <= Char2Glob:
            if EnumLoc == Func1(CharIndex, "C"):
                EnumLoc = Proc6(Ident1)
            CharIndex = chr(ord(CharIndex) + 1)
        IntLoc3 = IntLoc2 * IntLoc1
        IntLoc2 = IntLoc3 / IntLoc1
        IntLoc2 = 7 * (IntLoc3 - IntLoc2) - IntLoc1
        IntLoc1 = Proc2(IntLoc1)

    benchtime = perf_counter() - starttime - nulltime
    if benchtime == 0.0:
        loopsPerBenchtime = 0.0
    else:
        loopsPerBenchtime = loops / benchtime
    return benchtime, loopsPerBenchtime


def Proc1(PtrParIn):
    PtrParIn.PtrComp = NextRecord = PtrGlb.copy()
    PtrParIn.IntComp = 5
    NextRecord.IntComp = PtrParIn.IntComp
    NextRecord.PtrComp = PtrParIn.PtrComp
    NextRecord.PtrComp = Proc3(NextRecord.PtrComp)
    if NextRecord.Discr == Ident1:
        NextRecord.IntComp = 6
        NextRecord.EnumComp = Proc6(PtrParIn.EnumComp)
        NextRecord.PtrComp = PtrGlb.PtrComp
        NextRecord.IntComp = Proc7(NextRecord.IntComp, 10)
    else:
        PtrParIn = NextRecord.copy()
    NextRecord.PtrComp = None
    return PtrParIn


def Proc2(IntParIO):
    IntLoc = IntParIO + 10
    while 1:
        if Char1Glob == "A":
            IntLoc = IntLoc - 1
            IntParIO = IntLoc - IntGlob
            EnumLoc = Ident1
        if EnumLoc == Ident1:
            break
    return IntParIO


def Proc3(PtrParOut):
    global IntGlob

    if PtrGlb is not None:
        PtrParOut = PtrGlb.PtrComp
    else:
        IntGlob = 100
    PtrGlb.IntComp = Proc7(10, IntGlob)
    return PtrParOut


def Proc4():
    global Char2Glob

    BoolLoc = Char1Glob == "A"
    BoolLoc = BoolLoc or BoolGlob
    Char2Glob = "B"


def Proc5():
    global Char1Glob
    global BoolGlob

    Char1Glob = "A"
    BoolGlob = FALSE


def Proc6(EnumParIn):
    EnumParOut = EnumParIn
    if not Func3(EnumParIn):
        EnumParOut = Ident4
    if EnumParIn == Ident1:
        EnumParOut = Ident1
    elif EnumParIn == Ident2:
        if IntGlob > 100:
            EnumParOut = Ident1
        else:
            EnumParOut = Ident4
    elif EnumParIn == Ident3:
        EnumParOut = Ident2
    elif EnumParIn == Ident4:
        pass
    elif EnumParIn == Ident5:
        EnumParOut = Ident3
    return EnumParOut


def Proc7(IntParI1, IntParI2):
    IntLoc = IntParI1 + 2
    IntParOut = IntParI2 + IntLoc
    return IntParOut


def Proc8(Array1Par, Array2Par, IntParI1, IntParI2):
    global IntGlob

    IntLoc = IntParI1 + 5
    Array1Par[IntLoc] = IntParI2
    Array1Par[IntLoc + 1] = Array1Par[IntLoc]
    Array1Par[IntLoc + 30] = IntLoc
    for IntIndex in range(IntLoc, IntLoc + 2):
        Array2Par[IntLoc][IntIndex] = IntLoc
    Array2Par[IntLoc][IntLoc - 1] = Array2Par[IntLoc][IntLoc - 1] + 1
    Array2Par[IntLoc + 20][IntLoc] = Array1Par[IntLoc]
    IntGlob = 5


def Func1(CharPar1, CharPar2):
    CharLoc1 = CharPar1
    CharLoc2 = CharLoc1
    if CharLoc2 != CharPar2:
        return Ident1
    else:
        return Ident2


def Func2(StrParI1, StrParI2):
    IntLoc = 1
    while IntLoc <= 1:
        if Func1(StrParI1[IntLoc], StrParI2[IntLoc + 1]) == Ident1:
            CharLoc = "A"
            IntLoc = IntLoc + 1
    if CharLoc >= "W" and CharLoc <= "Z":
        IntLoc = 7
    if CharLoc == "X":
        return TRUE
    else:
        if StrParI1 > StrParI2:
            IntLoc = IntLoc + 7
            return TRUE
        else:
            return FALSE


def Func3(EnumParIn):
    EnumLoc = EnumParIn
    if EnumLoc == Ident3:
        return TRUE
    return FALSE


if __name__ == "__main__":
    import sys

    def error(msg):
        print(msg, end=" ", file=sys.stderr)
        print("usage: %s [number_of_loops]" % sys.argv[0], file=sys.stderr)
        sys.exit(100)

    nargs = len(sys.argv) - 1
    if nargs > 1:
        error("%d arguments are too many;" % nargs)
    elif nargs == 1:
        try:
            loops = int(sys.argv[1])
        except ValueError:
            error("Invalid argument %r;" % sys.argv[1])
    else:
        loops = LOOPS
    main(loops)

#! /usr/bin/env python
# -*- coding: utf-8 -*-
# flake8: noqa

"""
"PYSTONE" Benchmark Program

Version:        Python/1.1 (corresponds to C/1.1 plus 2 Pystone fixes)

Author:         Reinhold P. Weicker,  CACM Vol 27, No 10, 10/84 pg. 1013.

                Translated from ADA to C by Rick Richardson.
                Every method to preserve ADA-likeness has been used,
                at the expense of C-ness.

                Translated from C to Python by Guido van Rossum.

Version History:
                Fix Python 3.8 compatibility by replacing time.clock
                with time.perf_counter

                Inofficial version 1.1.1 by Chris Arndt:

                - Make it run under Python 2 and 3 by using
                  "from __future__ import print_function".
                - Change interpreter name in shebang line to plain
                  "python".
                - Add source code encoding declaration.

                Version 1.1 corrects two bugs in version 1.0:

                First, it leaked memory: in Proc1(), NextRecord ends
                up having a pointer to itself.  I have corrected this
                by zapping NextRecord.PtrComp at the end of Proc1().

                Second, Proc3() used the operator != to compare a
                record to None.  This is rather inefficient and not
                true to the intention of the original benchmark (where
                a pointer comparison to None is intended; the !=
                operator attempts to find a method __cmp__ to do value
                comparison of the record).  Version 1.1 runs 5-10
                percent faster than version 1.0, so benchmark figures
                of different versions can't be compared directly.

"""

from __future__ import print_function

LOOPS = 50000

from time import perf_counter

__version__ = "1.1.1"

[Ident1, Ident2, Ident3, Ident4, Ident5] = range(1, 6)


class Record:
    def __init__(self, PtrComp=None, Discr=0, EnumComp=0, IntComp=0, StringComp=0):
        self.PtrComp = PtrComp
        self.Discr = Discr
        self.EnumComp = EnumComp
        self.IntComp = IntComp
        self.StringComp = StringComp

    def copy(self):
        return Record(
            self.PtrComp, self.Discr, self.EnumComp, self.IntComp, self.StringComp
        )


TRUE = 1
FALSE = 0


def main(loops=LOOPS):
    benchtime, stones = pystones(loops)
    print("%g" % benchtime)


def pystones(loops=LOOPS):
    return Proc0(loops)


IntGlob = 0
BoolGlob = FALSE
Char1Glob = "\0"
Char2Glob = "\0"
Array1Glob = [0] * 51
Array2Glob = [x[:] for x in [Array1Glob] * 51]
PtrGlb = None
PtrGlbNext = None


def Proc0(loops=LOOPS):
    global IntGlob
    global BoolGlob
    global Char1Glob
    global Char2Glob
    global Array1Glob
    global Array2Glob
    global PtrGlb
    global PtrGlbNext

    starttime = perf_counter()
    for i in range(loops):
        pass
    nulltime = perf_counter() - starttime

    PtrGlbNext = Record()
    PtrGlb = Record()
    PtrGlb.PtrComp = PtrGlbNext
    PtrGlb.Discr = Ident1
    PtrGlb.EnumComp = Ident3
    PtrGlb.IntComp = 40
    PtrGlb.StringComp = "DHRYSTONE PROGRAM, SOME STRING"
    String1Loc = "DHRYSTONE PROGRAM, 1'ST STRING"
    Array2Glob[8][7] = 10

    starttime = perf_counter()

    for i in range(loops):
        Proc5()
        Proc4()
        IntLoc1 = 2
        IntLoc2 = 3
        String2Loc = "DHRYSTONE PROGRAM, 2'ND STRING"
        EnumLoc = Ident2
        BoolGlob = not Func2(String1Loc, String2Loc)
        while IntLoc1 < IntLoc2:
            IntLoc3 = 5 * IntLoc1 - IntLoc2
            IntLoc3 = Proc7(IntLoc1, IntLoc2)
            IntLoc1 = IntLoc1 + 1
        Proc8(Array1Glob, Array2Glob, IntLoc1, IntLoc3)
        PtrGlb = Proc1(PtrGlb)
        CharIndex = "A"
        while CharIndex <= Char2Glob:
            if EnumLoc == Func1(CharIndex, "C"):
                EnumLoc = Proc6(Ident1)
            CharIndex = chr(ord(CharIndex) + 1)
        IntLoc3 = IntLoc2 * IntLoc1
        IntLoc2 = IntLoc3 / IntLoc1
        IntLoc2 = 7 * (IntLoc3 - IntLoc2) - IntLoc1
        IntLoc1 = Proc2(IntLoc1)

    benchtime = perf_counter() - starttime - nulltime
    if benchtime == 0.0:
        loopsPerBenchtime = 0.0
    else:
        loopsPerBenchtime = loops / benchtime
    return benchtime, loopsPerBenchtime


def Proc1(PtrParIn):
    PtrParIn.PtrComp = NextRecord = PtrGlb.copy()
    PtrParIn.IntComp = 5
    NextRecord.IntComp = PtrParIn.IntComp
    NextRecord.PtrComp = PtrParIn.PtrComp
    NextRecord.PtrComp = Proc3(NextRecord.PtrComp)
    if NextRecord.Discr == Ident1:
        NextRecord.IntComp = 6
        NextRecord.EnumComp = Proc6(PtrParIn.EnumComp)
        NextRecord.PtrComp = PtrGlb.PtrComp
        NextRecord.IntComp = Proc7(NextRecord.IntComp, 10)
    else:
        PtrParIn = NextRecord.copy()
    NextRecord.PtrComp = None
    return PtrParIn


def Proc2(IntParIO):
    IntLoc = IntParIO + 10
    while 1:
        if Char1Glob == "A":
            IntLoc = IntLoc - 1
            IntParIO = IntLoc - IntGlob
            EnumLoc = Ident1
        if EnumLoc == Ident1:
            break
    return IntParIO


def Proc3(PtrParOut):
    global IntGlob

    if PtrGlb is not None:
        PtrParOut = PtrGlb.PtrComp
    else:
        IntGlob = 100
    PtrGlb.IntComp = Proc7(10, IntGlob)
    return PtrParOut


def Proc4():
    global Char2Glob

    BoolLoc = Char1Glob == "A"
    BoolLoc = BoolLoc or BoolGlob
    Char2Glob = "B"


def Proc5():
    global Char1Glob
    global BoolGlob

    Char1Glob = "A"
    BoolGlob = FALSE


def Proc6(EnumParIn):
    EnumParOut = EnumParIn
    if not Func3(EnumParIn):
        EnumParOut = Ident4
    if EnumParIn == Ident1:
        EnumParOut = Ident1
    elif EnumParIn == Ident2:
        if IntGlob > 100:
            EnumParOut = Ident1
        else:
            EnumParOut = Ident4
    elif EnumParIn == Ident3:
        EnumParOut = Ident2
    elif EnumParIn == Ident4:
        pass
    elif EnumParIn == Ident5:
        EnumParOut = Ident3
    return EnumParOut


def Proc7(IntParI1, IntParI2):
    IntLoc = IntParI1 + 2
    IntParOut = IntParI2 + IntLoc
    return IntParOut


def Proc8(Array1Par, Array2Par, IntParI1, IntParI2):
    global IntGlob

    IntLoc = IntParI1 + 5
    Array1Par[IntLoc] = IntParI2
    Array1Par[IntLoc + 1] = Array1Par[IntLoc]
    Array1Par[IntLoc + 30] = IntLoc
    for IntIndex in range(IntLoc, IntLoc + 2):
        Array2Par[IntLoc][IntIndex] = IntLoc
    Array2Par[IntLoc][IntLoc - 1] = Array2Par[IntLoc][IntLoc - 1] + 1
    Array2Par[IntLoc + 20][IntLoc] = Array1Par[IntLoc]
    IntGlob = 5


def Func1(CharPar1, CharPar2):
    CharLoc1 = CharPar1
    CharLoc2 = CharLoc1
    if CharLoc2 != CharPar2:
        return Ident1
    else:
        return Ident2


def Func2(StrParI1, StrParI2):
    IntLoc = 1
    while IntLoc <= 1:
        if Func1(StrParI1[IntLoc], StrParI2[IntLoc + 1]) == Ident1:
            CharLoc = "A"
            IntLoc = IntLoc + 1
    if CharLoc >= "W" and CharLoc <= "Z":
        IntLoc = 7
    if CharLoc == "X":
        return TRUE
    else:
        if StrParI1 > StrParI2:
            IntLoc = IntLoc + 7
            return TRUE
        else:
            return FALSE


def Func3(EnumParIn):
    EnumLoc = EnumParIn
    if EnumLoc == Ident3:
        return TRUE
    return FALSE


if __name__ == "__main__":
    import sys

    def error(msg):
        print(msg, end=" ", file=sys.stderr)
        print("usage: %s [number_of_loops]" % sys.argv[0], file=sys.stderr)
        sys.exit(100)

    nargs = len(sys.argv) - 1
    if nargs > 1:
        error("%d arguments are too many;" % nargs)
    elif nargs == 1:
        try:
            loops = int(sys.argv[1])
        except ValueError:
            error("Invalid argument %r;" % sys.argv[1])
    else:
        loops = LOOPS
    main(loops)
