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python中reader的next用法

日期:2019-05-27编辑作者:韦德国际1946官方网站

python中有个csv包(build-in),该包有个reader,按行读取csv文件中的数据

粗略的来说下:list = ['a', 'b', 'c']
渴求打印出每二个要素的目录和改成分,1种傻乎乎的法子:
python中reader的next用法。list = ['a', 'b', 'c']for i in range(0, len(list)):print i, list[i]0 a1 b2 c

简言之的来讲下:
list = ['a', 'b', 'c']
要求打字与印刷出每2个要素的目录和改成分,
一种傻乎乎的艺术:

The Reader - Wikipedia

reader.next()功能:打字与印刷csv文件中的第3行标题header

前日来用enumerate来缓慢解决那么些主题材料:

list = ['a', 'b', 'c']
for i in range(0, len(list)):
print i, list[i]
0 a
1 b
2 c

The Reader (2008 film) - Wikipedia)

(python三中的用法)

for i, j in enumerate(list):... print i, j...0 a1 b2 c>>>

近日来用enumerate来消除这些标题:

Characters[edit]

allElectronicsData = open(r'C:/pydata/AllElectronics.csv', 'rt')
reader = csv.reader(allElectronicsData)
headers = next(reader)

好了,enumerate的合法表明为:
Return an enumerate object. sequence must be a sequence, an iterator, or some other object which supports iteration. The next() method of the iterator returned by enumerate() returns a tuple containing a count (from start which defaults to 0) and the values obtained from iterating over sequence

>>> for i, j in enumerate(list):
... print i, j
...
0 a
1 b
2 c
>>>

Michael Berg, a German who is first portrayed as a 15-year-old boy and is revisited at later parts of his life: when he is a researcher in legal history, divorced with one daughter, Julia. Like many of his generation, he struggles to come to terms with his country's recent history.

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