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[英]Biopython translation error: TypeError: 'generator' object has no attribute '__getitem__'
[英]TypeError: 'generator' object has no attribute '__getitem__'
我写了一个应该返回字典的生成函数。 但是当我尝试打印字段时,我收到以下错误
print row2['SearchDate']
TypeError: 'generator' object has no attribute '__getitem__'
这是我的代码
from csv import DictReader
import pandas as pd
import numpy as np
def genSearch(SearchInfo):
for row2 in DictReader(open(SearchInfo)):
yield row2
train = 'minitrain.csv'
SearchInfo = 'SearchInfo.csv'
row2 = {'SearchID': -1}
for row1 in DictReader(open(train)):
if 'SearchID' in row1 and 'SearchID' in row2 and row1['SearchID'] == row2['SearchID']:
x = deepcopy( row1 )
#x['SearchDate'] = row2['percent']
x.update(row2)
print 'new'
print x
else:
#call your generator
row2 = genSearch(SearchInfo)
print row2['SearchDate']
Generator返回一个迭代器,你显然需要在它上面调用next。
你的最后一行代码应该是这样的 -
rows_generator = genSearch(SearchInfo)
row2 = next(rows_generator, None)
print row2['SearchDate']
理想情况下,我们在循环中使用迭代器,它会自动为我们做同样的事情。
生成器必须是迭代器 ,而不是迭代器 。 Iterables包含__item__()
和__getitem__()
方法,而迭代器包含next()
/ __next__()
方法(python版本2.x / 3.x)。
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