def bankersround(value, ndigits=0):
"""Round a number to a given precision.
Works like round() except that the round-half-even (banker's rounding)
algorithm is used instead of round-half-up.
>>> bankersround(5.5, 0)
6.0
>>> bankersround(6.5, 0)
6.0
>>> bankersround(-6.5, 0)
-6.0
>>> bankersround(1234.0, -2)
1200.0
"""
sign = int(value < 0) and -1 or 1
value = abs(value)
a, b = split_number(value)
digits = a + b
add = 0
i = len(a) + ndigits
if i < 0 or i >= len(digits):
pass
elif digits[i] > '5':
add = 1
elif digits[i] == '5' and digits[i - 1] in '13579':
add = 1
elif digits[i] == '5': # previous digit is even
# We round up unless all following digits are zero.
for j in range_type(i + 1, len(digits)):
if digits[j] != '0':
add = 1
break
scale = 10**ndigits
if isinstance(value, Decimal):
return Decimal(int(value * scale + add)) / scale * sign
else:
return float(int(value * scale + add)) / scale * sign
def bankersround(value, ndigits=0):
"""Round a number to a given precision.
Works like round() except that the round-half-even (banker's rounding)
algorithm is used instead of round-half-up.
>>> bankersround(5.5, 0)
6.0
>>> bankersround(6.5, 0)
6.0
>>> bankersround(-6.5, 0)
-6.0
>>> bankersround(1234.0, -2)
1200.0
"""
sign = int(value < 0) and -1 or 1
value = abs(value)
a, b = split_number(value)
digits = a + b
add = 0
i = len(a) + ndigits
if i < 0 or i >= len(digits):
pass
elif digits[i] > '5':
add = 1
elif digits[i] == '5' and digits[i-1] in '13579':
add = 1
elif digits[i] == '5': # previous digit is even
# We round up unless all following digits are zero.
for j in range_type(i + 1, len(digits)):
if digits[j] != '0':
add = 1
break
scale = 10**ndigits
if isinstance(value, Decimal):
return Decimal(int(value * scale + add)) / scale * sign
else:
return float(int(value * scale + add)) / scale * sign
def read_mo(fileobj):
"""Read a binary MO file from the given file-like object and return a
corresponding `Catalog` object.
:param fileobj: the file-like object to read the MO file from
:note: The implementation of this function is heavily based on the
``GNUTranslations._parse`` method of the ``gettext`` module in the
standard library.
"""
catalog = Catalog()
headers = {}
filename = getattr(fileobj, 'name', '')
buf = fileobj.read()
buflen = len(buf)
unpack = struct.unpack
# Parse the .mo file header, which consists of 5 little endian 32
# bit words.
magic = unpack('<I', buf[:4])[0] # Are we big endian or little endian?
if magic == LE_MAGIC:
version, msgcount, origidx, transidx = unpack('<4I', buf[4:20])
ii = '<II'
elif magic == BE_MAGIC:
version, msgcount, origidx, transidx = unpack('>4I', buf[4:20])
ii = '>II'
else:
raise IOError(0, 'Bad magic number', filename)
# Now put all messages from the .mo file buffer into the catalog
# dictionary
for i in range_type(0, msgcount):
mlen, moff = unpack(ii, buf[origidx:origidx + 8])
mend = moff + mlen
tlen, toff = unpack(ii, buf[transidx:transidx + 8])
tend = toff + tlen
if mend < buflen and tend < buflen:
msg = buf[moff:mend]
tmsg = buf[toff:tend]
else:
raise IOError(0, 'File is corrupt', filename)
# See if we're looking at GNU .mo conventions for metadata
if mlen == 0:
# Catalog description
lastkey = key = None
for item in tmsg.splitlines():
item = item.strip()
if not item:
continue
if b':' in item:
key, value = item.split(b':', 1)
lastkey = key = key.strip().lower()
headers[key] = value.strip()
elif lastkey:
headers[lastkey] += b'\n' + item
if b'\x04' in msg: # context
ctxt, msg = msg.split(b'\x04')
else:
ctxt = None
if b'\x00' in msg: # plural forms
msg = msg.split(b'\x00')
tmsg = tmsg.split(b'\x00')
if catalog.charset:
msg = [x.decode(catalog.charset) for x in msg]
tmsg = [x.decode(catalog.charset) for x in tmsg]
else:
if catalog.charset:
msg = msg.decode(catalog.charset)
tmsg = tmsg.decode(catalog.charset)
catalog[msg] = Message(msg, tmsg, context=ctxt)
# advance to next entry in the seek tables
origidx += 8
transidx += 8
catalog.mime_headers = headers.items()
return catalog
def read_mo(fileobj):
"""Read a binary MO file from the given file-like object and return a
corresponding `Catalog` object.
:param fileobj: the file-like object to read the MO file from
:note: The implementation of this function is heavily based on the
``GNUTranslations._parse`` method of the ``gettext`` module in the
standard library.
"""
catalog = Catalog()
headers = {}
filename = getattr(fileobj, 'name', '')
buf = fileobj.read()
buflen = len(buf)
unpack = struct.unpack
# Parse the .mo file header, which consists of 5 little endian 32
# bit words.
magic = unpack('<I', buf[:4])[0] # Are we big endian or little endian?
if magic == LE_MAGIC:
version, msgcount, origidx, transidx = unpack('<4I', buf[4:20])
ii = '<II'
elif magic == BE_MAGIC:
version, msgcount, origidx, transidx = unpack('>4I', buf[4:20])
ii = '>II'
else:
raise IOError(0, 'Bad magic number', filename)
# Now put all messages from the .mo file buffer into the catalog
# dictionary
for i in range_type(0, msgcount):
mlen, moff = unpack(ii, buf[origidx:origidx + 8])
mend = moff + mlen
tlen, toff = unpack(ii, buf[transidx:transidx + 8])
tend = toff + tlen
if mend < buflen and tend < buflen:
msg = buf[moff:mend]
tmsg = buf[toff:tend]
else:
raise IOError(0, 'File is corrupt', filename)
# See if we're looking at GNU .mo conventions for metadata
if mlen == 0:
# Catalog description
lastkey = key = None
for item in tmsg.splitlines():
item = item.strip()
if not item:
continue
if b':' in item:
key, value = item.split(b':', 1)
lastkey = key = key.strip().lower()
headers[key] = value.strip()
elif lastkey:
headers[lastkey] += b'\n' + item
if b'\x04' in msg: # context
ctxt, msg = msg.split(b'\x04')
else:
ctxt = None
if b'\x00' in msg: # plural forms
msg = msg.split(b'\x00')
tmsg = tmsg.split(b'\x00')
if catalog.charset:
msg = [x.decode(catalog.charset) for x in msg]
tmsg = [x.decode(catalog.charset) for x in tmsg]
else:
if catalog.charset:
msg = msg.decode(catalog.charset)
tmsg = tmsg.decode(catalog.charset)
catalog[msg] = Message(msg, tmsg, context=ctxt)
# advance to next entry in the seek tables
origidx += 8
transidx += 8
catalog.mime_headers = headers.items()
return catalog
