Python CsvReader Next 函数
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CsvReader Next function
提问by Andy
i am given a csv file but i want to skip the first row of data and move on to the next. Here is my code:
我得到了一个 csv 文件，但我想跳过第一行数据并转到下一行。这是我的代码：
def read_csv(inputfile):
return list(csv.reader(inputfile)) #<-----
def generate_xml(reader,outfile):
root = Element('Solution')
root.set('version','1.0')
tree = ElementTree(root)
head = SubElement(root, 'DrillHoles')
description = SubElement(head,'description')
current_group = None
i = 1
for row in reader.next(): #<-----
x1,y1,z1,x2,y2,z2,cost = row
if current_group is None or i != current_group.text:
current_group = SubElement(description, 'hole',{'hole_id':"%s"%i})
collar = SubElement(current_group,'collar')
toe = SubElement(current_group,'toe')
cost1 = SubElement(current_group,'cost')
collar.text = ','.join((x1,y1,z1))
toe.text = ','.join((x2,y2,z2))
cost1.text = cost
i+=1
head.set('total_holes', '%s'%i)
indent.indent(root)
tree.write(outfile)
As you can see, i return the csv file as a list then i pass it onto the generate_xml function. However when i run the complete program there is an
如您所见，我将 csv 文件作为列表返回，然后将其传递给 generate_xml 函数。但是，当我运行完整的程序时，有一个
error: 'list' object has no attribute 'next'
采纳答案by Martijn Pieters
You have a list, not an iterator. Just slice it instead:
你有一个list，而不是一个迭代器。只需切片即可：
for row in reader[1:]:
or skip that first row when you still have an actual csv.reader()object:
或者当您还有实际csv.reader()对象时跳过第一行：
def read_csv(inputfile):
reader = csv.reader(inputfile)
next(reader)
return list(reader)
You'd be better off returning the readerobject instead of reading all rows into memory there; unless you absolutely need random access to the rows.
您最好返回reader对象而不是将所有行读入内存中；除非您绝对需要随机访问行。
You also should really use the next()functioninstead as it works for Python 2.6+ and 3, where the iterator .next()method has been renamed to .__next__().
您还应该真正使用该next()函数，因为它适用于 Python 2.6+ 和 3，其中迭代器.next()方法已重命名为.__next__().
You'd otherwise neveruse for row in reader.next(), because .next()on a csv.reader()iterator returns onerow.
否则你永远不会使用for row in reader.next()，因为.next()在csv.reader()迭代器返回一个排。
回答by Yuchao Jiang
For python 2.x, the code is:
对于python 2.x，代码是：
data = []
with open('xxx.csv') as f:
r = csv.reader(f)
name = r.next()[1] # assume the first 2 rows are name and unit
unit = r.next()
for row in r:
data.append(row)
For python 3.x, use next(r)instead of r.next()
对于 python 3.x，使用next(r)代替r.next()
