我试图用Python列表中的值创建一个.csv文件。当我打印列表中的值时，它们都是unicode(?)，即它们看起来像这样
[u'value 1', u'value 2', ...]
如果我遍历列表中的值，即mylist中的v:打印v，它们看起来是纯文本。
然后在每一个之间加上print '。join(mylist)
我可以输出到一个文件，即。
myfile = open(...)
print >>myfile, ','.join(mylist)
但是我想输出到CSV，并在列表中的值周围有分隔符。
"value 1", "value 2", ...
我找不到一个简单的方法来包括在格式分隔符，例如，我已经尝试通过连接语句。我该怎么做呢?
当前回答
我发现最好的选择是使用numpy模块中的savetxt:
import numpy as np
np.savetxt("file_name.csv", data1, delimiter=",", fmt='%s', header=header)
以防你有多个需要堆叠的列表
np.savetxt("file_name.csv", np.column_stack((data1, data2)), delimiter=",", fmt='%s', header=header)
其他回答
创建并写入csv文件
下面的示例演示创建和写入csv文件。 要使一个动态文件写入器，我们需要导入一个包import csv，然后需要创建一个文件引用的文件实例 Ex:-使用open("D:\sample.csv"，"w"，newline="")作为文件写入器
here if the file does not exist with the mentioned file directory then python will create a same file in the specified directory, and "w" represents write, if you want to read a file then replace "w" with "r" or to append to existing file then "a". newline="" specifies that it removes an extra empty row for every time you create row so to eliminate empty row we use newline="", create some field names(column names) using list like fields=["Names","Age","Class"], then apply to writer instance like writer=csv.DictWriter(file_writer,fieldnames=fields) here using Dictionary writer and assigning column names, to write column names to csv we use writer.writeheader() and to write values we use writer.writerow({"Names":"John","Age":20,"Class":"12A"}) ,while writing file values must be passed using dictionary method , here the key is column name and value is your respective key value
import csv
with open("D:\\sample.csv","w",newline="") as file_writer:
fields=["Names","Age","Class"]
writer=csv.DictWriter(file_writer,fieldnames=fields)
writer.writeheader()
writer.writerow({"Names":"John","Age":21,"Class":"12A"})
我发现最好的选择是使用numpy模块中的savetxt:
import numpy as np
np.savetxt("file_name.csv", data1, delimiter=",", fmt='%s', header=header)
以防你有多个需要堆叠的列表
np.savetxt("file_name.csv", np.column_stack((data1, data2)), delimiter=",", fmt='%s', header=header)
import csv
with open(..., 'wb') as myfile:
wr = csv.writer(myfile, quoting=csv.QUOTE_ALL)
wr.writerow(mylist)
编辑:这只适用于python 2.x。
让它与python 3一起工作。x用w代替wb(见这个SO答案)
with open(..., 'w', newline='') as myfile:
wr = csv.writer(myfile, quoting=csv.QUOTE_ALL)
wr.writerow(mylist)
以下是Alex Martelli的安全版本:
import csv
with open('filename', 'wb') as myfile:
wr = csv.writer(myfile, quoting=csv.QUOTE_ALL)
wr.writerow(mylist)
下面是另一个不需要csv模块的解决方案。
print ', '.join(['"'+i+'"' for i in myList])
例子:
>>> myList = [u'value 1', u'value 2', u'value 3']
>>> print ', '.join(['"'+i+'"' for i in myList])
"value 1", "value 2", "value 3"
但是，如果初始列表包含一些“，则不会转义。如果需要，可以调用一个函数像这样转义它:
print ', '.join(['"'+myFunction(i)+'"' for i in myList])
