我让你开始了。这是我对你的问题的解释。我把执行留给parse_complex你。
class DateParser(object):
"""parse dates according to the custom rules here:
>>> DateParser("Sat 1 Dec - 11h + 14h / Sun 2 Dec - 12h30").parse()
("Sat 1 Dec 11h", "Sat 1 Dec 14h", "Sun 2 Dec 12h30")
>>> DateParser("Tue 27 + Wed 28 Nov - 20h30").parse()
("Tue 27 Nov 20h30", "Wed 28 Nov 20h30")
>>> DateParser("Fri 4 + Sat 5 Jan - 20h30").parse()
("Fri 4 Jan 20h30", "Sat 5 Jan 20h30")
>>> DateParser("Wed 23 Jan - 20h").parse()
("Wed 23 Jan 20h")
>>> DateParser("Sat 26 Jan - 11h + 14h / Sun 27 Jan - 11h").parse()
("Sat 26 Jan 11h", "Sat 26 Jan 14h", "Sun 27 Jan 11h")
>>> DateParser("Fri 8 and Sat 9 Feb - 20h30 + thu 1 feb - 15h").parse()
("Fri 8 Feb 20h30", "Sat 9 Feb 20h30", "Thu 1 feb 15h")
>>> DateParse("Sat 2 Mar - 11h + 14h / Sun 3 Mar - 11h").parse()
("Sat 2 Mar 11h", "Sat 2 Mar 14h", "Sun 3 Mar 11h")
>>> DateParser("Wed 12, Thu 13, Fri 14 and Sat 15 Jun - 19h + Sun 16 Jun - 12h30").parse()
("Wed 12 Jun 19h", "Thu 13 Jun 19h", "Fri 14 Jun 19h", "Sat 15 Jun 19h", "Sun 16 Jun 12h30")
"""
def __init__(self, line):
self.date = line
self.dates = self.split_dates(line)
self.final = []
self.days = ['mon', 'tue', 'wed', 'thu', 'fri', 'sat', 'sun']
self.mons = ['jan', 'feb', 'mar', 'apr', 'may', 'jun', 'jul', 'aug', 'sep', 'oct', 'nov', 'dec']
def parse(self):
if self.is_complex():
self.parse_complex()
else:
self.parse_simple()
return tuple(self.final)
def parse_simple(self):
"""typical formats:
Day 00 + Day 01 Mon - 00h00
Day 00 Mon - 00h00 + 01h00
Day 00 Mon - 00h00 / Day 02 Mon - 00h00
"""
for date in self.dates:
mods = self.split_modifiers(date)
date_mods = []
for mod in mods:
if self.is_complete(mod):
#only *one* base_date
base_date, time = self.split_time(mod)
date_mods.append(time)
else:
date_mods.append(mod)
for mod in date_mods:
if self.is_hour(mod):
#Sat 1 Dec - 11h + 14h
self.final.append(' '.join([base_date, mod]))
else:
#Fri 4 + Sat 5 Jan - 20h30
self.final.append(' '.join([mod, self.extract_month(base_date), time]))
def parse_complex(self):
"""typical format:
Day 00, Day 01 and Day 02 Mon - 00h00 + Day 03 Mon 01h00
"""
raise NotImplementedError()
def is_complex(self):
"""presence of the complex date attribute requires special parsing"""
return self.date.find(' and ') > -1
def is_complete(self, section):
"""section has format `Day 00 Mon - 00h00`
must have no modifiers to determine completeness
"""
sections = map(lambda x: x.lower(), section.split())
try:
dow, dom, moy, dash, time = sections
except ValueError, e:
return False
return all([dow in self.days, moy in self.mons])
def is_hour(self, section):
return section[0].isdigit()
def is_day(self, section):
return section[:3].lower() in self.days
def extract_month(self, section):
"""return the month present in the string, if any"""
for mon in self.mons:
if section.lower().find(mon) > -1:
found = section.lower().index(mon)
return section[found : found + 3]
return None
def split_dates(self, section):
"""split individual dates from a list of dates"""
return section.split(' / ')
def split_time(self, section):
"""split individual times from a complete date"""
return section.split(' - ')
def split_modifiers(self, section):
"""extend a date by implying that they share a date or a time
modifiers change their meaning when parsing a complex date
"""
return section.split(' + ')
>>> DateParser("Fri 4 + Sat 5 Jan - 20h30 / Sat 1 Dec - 11h + 14h + 16h / Sun 2 Dec - 12h30").parse()
('Fri 4 Jan 20h30', 'Sat 5 Jan 20h30', 'Sat 1 Dec 11h', 'Sat 1 Dec 14h', 'Sat 1 Dec 16h', 'Sun 2 Dec 12h30')
如果您对我记录本课程的方式有任何疑问，请随时回复我，我可以为您提供更多帮助。这个问题比我最初想象的要复杂一些，我需要先完成一些其他的事情。