我有一长串这样的表格——
a = [[1.2,'abc',3],[1.2,'werew',4],........,[1.4,'qew',2]]
也就是说，列表中的值是不同类型的——float,int, strings。我如何将它写入csv文件，使我的输出csv文件看起来像这样
1.2,abc,3
1.2,werew,4
.
.
.
1.4,qew,2
当前回答
Ambers的解决方案也适用于numpy数组:
from pylab import *
import csv
array_=arange(0,10,1)
list_=[array_,array_*2,array_*3]
with open("output.csv", "wb") as f:
writer = csv.writer(f)
writer.writerows(list_)
其他回答
使用csv。在我庞大的列表中，作者花了相当长的时间。我决定使用熊猫，它更快，更容易控制和理解:
import pandas
yourlist = [[...],...,[...]]
pd = pandas.DataFrame(yourlist)
pd.to_csv("mylist.csv")
好的部分是你可以改变一些东西来创建一个更好的csv文件:
yourlist = [[...],...,[...]]
columns = ["abcd","bcde","cdef"] #a csv with 3 columns
index = [i[0] for i in yourlist] #first element of every list in yourlist
not_index_list = [i[1:] for i in yourlist]
pd = pandas.DataFrame(not_index_list, columns = columns, index = index)
#Now you have a csv with columns and index:
pd.to_csv("mylist.csv")
确保在创建写入器时指明lineterinator='\n';否则，当数据源来自其他CSV文件时，可能会在每个数据行后写入额外的空行…
以下是我的解决方案:
with open('csvfile', 'a') as csvfile:
spamwriter = csv.writer(csvfile, delimiter=' ',quotechar='|', quoting=csv.QUOTE_MINIMAL, lineterminator='\n')
for i in range(0, len(data)):
spamwriter.writerow(data[i])
你可以用熊猫:
In [1]: import pandas as pd
In [2]: a = [[1.2,'abc',3],[1.2,'werew',4],[1.4,'qew',2]]
In [3]: my_df = pd.DataFrame(a)
In [4]: my_df.to_csv('my_csv.csv', index=False, header=False)
Ambers的解决方案也适用于numpy数组:
from pylab import *
import csv
array_=arange(0,10,1)
list_=[array_,array_*2,array_*3]
with open("output.csv", "wb") as f:
writer = csv.writer(f)
writer.writerows(list_)
如何转储列表的列表到pickle和恢复它与pickle模块?这很方便。
>>> import pickle
>>>
>>> mylist = [1, 'foo', 'bar', {1, 2, 3}, [ [1,4,2,6], [3,6,0,10]]]
>>> with open('mylist', 'wb') as f:
... pickle.dump(mylist, f)
>>> with open('mylist', 'rb') as f:
... mylist = pickle.load(f)
>>> mylist
[1, 'foo', 'bar', {1, 2, 3}, [[1, 4, 2, 6], [3, 6, 0, 10]]]
>>>
