8000 bpo-29869: Allow underscores in numeric literals in lib2to3. by nevsan · Pull Request #752 · python/cpython · GitHub
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bpo-29869: Allow underscores in numeric literals in lib2to3. #752

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Merged
merged 3 commits into from
Apr 13, 2017
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bpo-29869: Allow underscores in numeric literals in lib2to3. #752

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6261567
Allow underscores in numeric literals in lib2to3.
nevsan Mar 21, 2017
2fd46cc
Stricter literal parsing for Python 3.6 in lib2to3.pgen2.tokenize.
nevsan Mar 22, 2017
b6995a0
Add test case for underscores in literals in Python 3.
nevsan Mar 23, 2017
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Stricter literal parsing for Python 3.6 in lib2to3.pgen2.tokenize.
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@nevsan
nevsan committed Mar 23, 2017
commit 2fd46ccb325c20ee22e9ac66699de8adf46c75c4
16 changes: 8 additions & 8 deletions Lib/lib2to3/pgen2/tokenize.py
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Expand Up @@ -54,16 +54,16 @@ def maybe(*choices): return group(*choices) + '?'
Ignore = Whitespace + any(r'\\\r?\n' + Whitespace) + maybe(Comment)
Name = r'[a-zA-Z_]\w*'

Binnumber = r'0[bB][01_]*'
Hexnumber = r'0[xX][\da-fA-F_]*[lL]?'
Octnumber = r'0[oO]?[0-7_]*[lL]?'
Decnumber = r'[1-9][\d_]*[lL]?'
Binnumber = r'0[bB]_?[01]+(?:_[01]+)*'
Hexnumber = r'0[xX]_?[\da-fA-F]+(?:_[\da-fA-F]+)*[lL]?'
Octnumber = r'0[oO]?_?[0-7]+(?:_[0-7]+)*[lL]?'
Decnumber = group(r'[1-9]\d*(?:_\d+)*[lL]?', '0[lL]?')
Intnumber = group(Binnumber, Hexnumber, Octnumber, Decnumber)
Exponent = r'[eE][-+]?\d+'
Pointfloat = group(r'\d+\.\d*', r'\.\d+') + maybe(Exponent)
Expfloat = r'\d+' + Exponent
Exponent = r'[eE][-+]?\d+(?:_\d+)*'
Pointfloat = group(r'\d+(?:_\d+)*\.(?:\d+(?:_\d+)*)?', r'\.\d+(?:_\d+)*') + maybe(Exponent)
Expfloat = r'\d+(?:_\d+)*' + Exponent
Floatnumber = group(Pointfloat, Expfloat)
Imagnumber = group(r'\d+[jJ]', Floatnumber + r'[jJ]')
Imagnumber = group(r'\d+(?:_\d+)*[jJ]', Floatnumber + r'[jJ]')
Number = group(Imagnumber, Floatnumber, Intnumber)

# Tail end of ' string.
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