数据为:
[('1985-08','15 .00'),('1985-08','14 .88'),('1985-08','15 .25'),('1985-08','15 .25'),( '1985-08','15 .13'),('1985-08','14 .75'),('1985-08','14 .88'),('1985-08','15 .25'),('1985 -08','15 .25'),('1985-08','15 .00'),('1985-08','14 .63'),('1985-08','14 .50'),('1985-08 ','14 .63'),('1985-08','15 .25'),('1985-08','15 .00'),('1985-08','15 .25'),('1985-08', '15 .13'),('1985-08','14.88'),('1985-08','15.25'),('1985-08','15.38'),('1985-08','15.75 '),('1985-08','15.88'),('1985-07','15.88'),('1985-07','16.25'),('1985-07','16.00') ,('1985-07','16 .62'),('1985-07','16 .62'),('1985-07','16 .25'),('1985-07','16 .50'),( '1985-07','16 .87'),('1985-07','17 .37'),('1985-07','17 .25'),('1985-07','17 .62'),('1985 -07','17 .50'),('1985-07','17 .75'),('1985-07','17 .87'),('1985-07','18 .00'),('1985-07 ','18 .00'),('1985-07','17 .62'),('1985-07','17 .62'),('1985-07','17 .62'),('1985-07', '17 .50'),('1985-07','17.25'),('1985-07','18.12')]
我的代码:
def average_data(list_of_tuples):
strMonth = []
counter = 0
addition = 0
while True:
if (strMonth[counter])[0] == (strMonth[counter+1])[0]: #line 31
addition += float(strMonth[counter][1])
result2 = addition
else:
continue
print(result2)
return result2
def main():
file_obj = get_input_descriptor()
column = int(input('What column:'))
get_data_list(file_obj, column)
result2 =get_data_list(file_obj, column)
average_data(result2)
file_obj.close()
main()
Python Shell的错误代码:
File "C:\Users\admin\Desktop\proj.py", line 31, in average_data
if (strMonth[counter])[0] == (strMonth[counter+1])[0]:
IndexError: list index out of range
怎么了我想获取每个月的总数。还有其他方法可以解决此问题吗?
最佳答案
strMonth
为空。它没有第0个元素,因此strMonth[counter]
引发一个IndexError
:
In [29]: strMonth = []
In [30]: counter = 0
In [31]: strMonth[counter]
IndexError: list index out of range
您可以使用
dict
(或collections.defaultdict)将yearmonth字符串映射到表示值总和的浮点数。import collections
def average_data(strMonth):
result = collections.defaultdict(float)
for yearmonth, val in strMonth:
result[yearmonth] += float(val)
return dict(result)
def main():
result2 = [('1985-08', '15.00'), ('1985-08', '14.88'), ('1985-08', '15.25'), ('1985-08', '15.25'), ('1985-08', '15.13'), ('1985-08', '14.75'), ('1985-08', '14.88'), ('1985-08', '15.25'), ('1985-08', '15.25'), ('1985-08', '15.00'), ('1985-08', '14.63'), ('1985-08', '14.50'), ('1985-08', '14.63'), ('1985-08', '15.25'), ('1985-08', '15.00'), ('1985-08', '15.25'), ('1985-08', '15.13'), ('1985-08', '14.88'), ('1985-08', '15.25'), ('1985-08', '15.38'), ('1985-08', '15.75'), ('1985-08', '15.88'), ('1985-07', '15.88'), ('1985-07', '16.25'), ('1985-07', '16.00'), ('1985-07', '16.62'), ('1985-07', '16.62'), ('1985-07', '16.25'), ('1985-07', '16.50'), ('1985-07', '16.87'), ('1985-07', '17.37'), ('1985-07', '17.25'), ('1985-07', '17.62'), ('1985-07', '17.50'), ('1985-07', '17.75'), ('1985-07', '17.87'), ('1985-07', '18.00'), ('1985-07', '18.00'), ('1985-07', '17.62'), ('1985-07', '17.62'), ('1985-07', '17.62'), ('1985-07', '17.50'), ('1985-07', '17.25'), ('1985-07', '18.12')]
print(average_data(result2))
main()
产量
{'1985-07': 378.08000000000004, '1985-08': 332.16999999999996}
关于python - 我的def函数出了什么问题?如何解决?,我们在Stack Overflow上找到一个类似的问题:https://stackoverflow.com/questions/15079862/