-2
Nooby編碼器在這裏！我的任務是編寫能夠打印任何給定日期的星期幾的內容。我的代碼工作正常，但是當我運行任何不正確的格式（即「// 2011」或「12/A/2011」），它會給我這個錯誤：Python 3.2 UnboundLocalError日期到星期幾轉換器
line 55, in main if is_date_valid(month, day, year) == False:
UnboundLocalError: local variable 'month' referenced before assignment
雖然如果我嘗試「13/2/2011」，運行良好。請幫助我找到我的問題，因爲我的老師在向我詢問時不知道解決方案！ 這裏是（如有必要，無視我的評論：p）全碼 非常感謝你：d
import sys
DAYS_IN_MONTH = ('31', '28', '31', '30', '31', '30', '31', '31', '30', '31', '30', '31')
MONTHS_IN_WORDS = ("January", "February", "March", "April", "May", "June", "July", "August", "September", "October", "November", "December")
DAYS_OF_WEEK = ('Monday', 'Tuesday', 'Wednesday', 'Thursday', 'Friday', 'Saturday', 'Sunday')
def get_date():
str_date = input('Enter date: ')#.strip() = method :D
parts = str_date.split('/')#pasts = ['12', '2', '2011']
length = len(parts)
if length != 3:
raise ValueError('Invalid format for date.')
for i in range(length):
parts[i] = parts[i].strip()
if len(parts[i]) == 0 or not(parts[i].isdigit()):
raise ValueError('Invalid format for date.')
return(int(parts[0]), int(parts[1]), int(parts[2]))
def is_date_valid(month, day, year): #is_date_valid = name of function
if month < 1 or month > 12 or day < 1 or year < 0:
return False
if month != 2:
return int(day) <= int(DAYS_IN_MONTH[month-1])
additional = 0
if year % 400 == 0 or year % 4 == 0 and year % 100 != 0:
additional = 1
return int(day) <= int(DAYS_IN_MONTH[1]) + int(additional)
#month, day, year = arguments of function
def date_as_string(month, day, year):
if month > 0 and month < 13:
return MONTHS_IN_WORDS[month-1] + ' ' + str(day) + ', ' + str(year)
def day_of_week(month, day, year):
if month < 3:
month += 12
year -= 1
m = month
q = day
J = year // 100
K = year % 100
h = (q + 26*(m+1)//10 + K + K//4 + J//4 - 2*J) % 7
dayweek = DAYS_OF_WEEK[h-2]
return dayweek
def main():
print('This program calculates the day of the week for any date.')
try:
(month, day, year) = get_date()
except ValueError as error:
print("ERROR:", error)
sys.exit(1)
if is_date_valid(month, day, year) == False:
print(str(month) + '/' + str(day) + '/' + str(year) + ' is an invalid date.')
print()
else:
print(date_as_string(month, day, year) + ' is a ' + day_of_week(month, day, year) + '.')
print()
#any function call that can raise an error must be put inside a try block
if __name__ == '__main__':
main()