[英]creating named instances of a class within a for loop — related to networkx — Python
[英]Creating instances of a class in a loop in python?
所以我试图使用OOP在python中创建日历,在这里我设置了Month类:
week_days=['Sat', 'Sun', 'Mon', 'Teu', 'Wed', 'Thu', 'Fri']
class Month(object):
#class variable.
days=[]
def __init__(self, label, numdays, starts_with):
self.label=label
count=week_days.index(starts_with)
for i in range(1, numdays+1):
self.days.append([i, week_days[count]])
count+=1
if count>6:
count=0 #loop around week_days
self.NMFD = week_days[count] #next month 1st day
效果很好,这是Year类的:
months_list=[('Jan', 31), ('Feb', 29), ('Mar', 31), ('Apr', 30)...]
class Year(object):
#class variable.
months=[]
def __init__(self):
FD= 'Sat'
for item in months_list:
m=Month(item[0], item[1], FD)
self.months.append(m)
FD = m.NMFD
#Debug...
print m.label
print m.days
print 'Next month first day =' + FD
print '\n'
if __name__ == '__main__':
year = Year()
问题是,月份总是从我在for循环之前提供的“星期六”开始,尽管变量FD(第一天)在每次迭代中都重新分配给了m.NMFD,这是输出:
Jan
[[1, 'Sat'], [2, 'Sun'], [3, 'Mon'], [4, 'Teu']...[30, 'Sun'], [31, 'Mon']]
Next month first day =Teu
Feb
[[1, 'Sat'], [2, 'Sun'], [3, 'Mon'], [4, 'Teu']...[28, 'Mon'], [29, 'Teu']]
Next month first day =Wed
Mar
[[1, 'Sat'], [2, 'Sun'], [3, 'Mon'], [4, 'Teu']...[30, 'Thu'], [31, 'Fri']]
Next month first day =Sat
Apr
[[1, 'Sat'], [2, 'Sun'], [3, 'Mon'], [4, 'Teu']...[28, 'Fri'], [29, 'Sat'], [30, 'Sun']]
Next month first day =Mon
May
[[1, 'Sat'], [2, 'Sun'], [3, 'Mon'], [4, 'Teu']...] #.....etc
我尝试使用字典或元组代替嵌套列表,但是它没有用,并且在Stack Overflow上也找不到令人满意的答案……任何帮助将不胜感激,在此先感谢您。
尝试这个:
class Month(object):
def __init__(self, label, numdays, starts_with):
self.label=label
self.days = []
count=week_days.index(starts_with)
for i in range(1, numdays+1):
self.days.append([i, week_days[count]])
count+=1
if count>6:
count=0 #loop around week_days
self.NMFD = week_days[count]
每当您构造类时,都会调用该类变量。
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