Python 如何将for循环中的结果写入多个CSV文件
我有 需要两个csv文件作为Python 如何将for循环中的结果写入多个CSV文件,python,csv,for-loop,contextmanager,Python,Csv,For Loop,Contextmanager,我有 需要两个csv文件作为 with open ('~/abc.csv', 'w') as f: write1 = csv.write(f) write1.writerow(['header1', 'header2', 'header3', 'header4']) with open ('~/def.csv', 'w') as g: write2 = csv.write(g) write2.writerow(['header1', 'header2', 'he
with open ('~/abc.csv', 'w') as f:
write1 = csv.write(f)
write1.writerow(['header1', 'header2', 'header3', 'header4'])
with open ('~/def.csv', 'w') as g:
write2 = csv.write(g)
write2.writerow(['header1', 'header2', 'header3', 'header4', 'header5', 'header6'])
for iteration in a_list:
perform calculations
result1 = ([h1, h2, h3, h4],[l1, l2, l3, l4],[m1, m2, m3, m4], ...,[])
for pa in result1:
write1.writerow(pa)
def fun(result1):
result2 = ([n1, n2, n3, n4, n5, n6],[p1, p2, p3, p4, p5, p6], [], ...[])
for pb in result2:
write2.writerow(pb)
及
当所有迭代都完成时,这可以很容易地完成,并且可以使用writer.writerows(pa)轻松地将单独附加的(列表)result1和result2写入单独的文件。但是,我希望在每次迭代中写入csv文件,这样,如果出于某种原因必须中断循环,我就不会错过
谢谢大家! 当前,您只声明了一个writer变量。您需要第二个writer变量
'header1', 'header2', 'header3', 'header4', 'header5', 'header6'
n1, n2, n3, n4, n5, n6
p1, p2, p3, p4, p5, p6
您可以在上下文管理器中放置两个文件,并具有两个
csv.writer
对象(自Python 2.7以来):
从文档中(对于Python和之前的文档都是相同的)
对于多个项,上下文管理器的处理就像嵌套了多个With语句一样:
相当于
这表明了另一种方法,那就是让嵌套更深一层
with A() as a:
with B() as b:
suite
请回答您的问题并修复代码的缩进。使用open(“~/abc.csv”,“w”)作为f,open(“~/def.csv”,“w”)作为g:invalid syntax您使用的是什么版本的Python?这在Python2.7.Python3.4.3版中对我有效,因为它在3.4版中也有效。我错过了第一行。第二个文件也使用了。谢谢你的支持,杰米!我使用了不同的write变量定义。但是,在这里转换为示例代码时,我错过了它。您可以编辑示例代码,这样人们就不会在不是真正问题的事情上浪费时间。对此表示抱歉。编辑!
fWriter = csv.write(f)
...
gWriter = csv.write(g)
...
fWriter.writerow(pa)
...
gWriter.writerow(pb)
with open ('~/abc.csv', 'w') as f, open ('~/def.csv', 'w') as g:
writer1 = csv.writer(f)
writer2 = csv.writer(g)
writer1.writerow(['header1', 'header2', 'header3', 'header4'])
writer2.writerow(['header1', 'header2', 'header3', 'header4', 'header5', 'header6'])
for iteration in a_list:
# perform calculations
for pa in result1:
writer1.writerow(pa)
for pb in result2:
writer2.writerow(pb)
with A() as a, B() as b:
suite
with A() as a:
with B() as b:
suite
with open ('~/abc.csv', 'w') as f:
with open ('~/def.csv', 'w') as g:
writer1 = csv.writer(f)
writer2 = csv.writer(g)
...