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
Merged

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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16 changes: 8 additions & 8 deletions Lib/lib2to3/pgen2/tokenize.py
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Original file line number Diff line number Diff line change
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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22 changes: 22 additions & 0 deletions Lib/lib2to3/tests/data/py3_test_grammar.py
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Expand Up @@ -72,6 +72,28 @@ def testLongIntegers(self):
x = 0b100000000000000000000000000000000000000000000000000000000000000000000
x = 0B111111111111111111111111111111111111111111111111111111111111111111111

def testUnderscoresInNumbers(self):
# Integers
x = 1_0
x = 123_456_7_89
x = 0xabc_123_4_5
x = 0X_abc_123
x = 0B11_01
x = 0b_11_01
x = 0o45_67
x = 0O_45_67

# Floats
x = 3_1.4
x = 03_1.4
x = 3_1.
x = .3_1
x = 3.1_4
x = 0_3.1_4
x = 3e1_4
x = 3_1e+4_1
x = 3_1E-4_1

def testFloats(self):
x = 3.14
x = 314.
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