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splitTokens.py

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def splitTokens(exprStr)-> list:

tokens = []

val = 0

valProcessing = False

for c in exprStr:

if c == ' ': # ignore blank

continue

if c in '0123456789': # number case

val = val * 10 + int(c)

valProcessing = True

else:

if valProcessing: # sign case

tokens.append(val)

val = 0

valProcessing = False

tokens.append(c)

if valProcessing:

tokens.append(val)

return tokens