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
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)
你当然应该使用CSV模块，但你可能需要编写unicode。对于那些需要编写unicode的人，这是来自示例页面的类，您可以将其用作util模块:
import csv, codecs, cStringIO
class UTF8Recoder:
"""
Iterator that reads an encoded stream and reencodes the input to UTF-8
"""
def __init__(self, f, encoding):
self.reader = codecs.getreader(encoding)(f)
def __iter__(self):
return self
def next(self):
return self.reader.next().encode("utf-8")
class UnicodeReader:
"""
A CSV reader which will iterate over lines in the CSV file "f",
which is encoded in the given encoding.
"""
def __init__(self, f, dialect=csv.excel, encoding="utf-8", **kwds):
f = UTF8Recoder(f, encoding)
self.reader = csv.reader(f, dialect=dialect, **kwds)
def next(self):
row = self.reader.next()
return [unicode(s, "utf-8") for s in row]
def __iter__(self):
return self
class UnicodeWriter:
"""
A CSV writer which will write rows to CSV file "f",
which is encoded in the given encoding.
"""
def __init__(self, f, dialect=csv.excel, encoding="utf-8", **kwds):
# Redirect output to a queue
self.queue = cStringIO.StringIO()
self.writer = csv.writer(self.queue, dialect=dialect, **kwds)
self.stream = f
self.encoder = codecs.getincrementalencoder(encoding)()
def writerow(self, row):
self.writer.writerow([s.encode("utf-8") for s in row])
# Fetch UTF-8 output from the queue ...
data = self.queue.getvalue()
data = data.decode("utf-8")
# ... and reencode it into the target encoding
data = self.encoder.encode(data)
# write to the target stream
self.stream.write(data)
# empty queue
self.queue.truncate(0)
def writerows(self, rows):
for row in rows:
self.writerow(row)
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)
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)
使用python的csv模块来读写逗号或制表符分隔的文件。csv模块是首选，因为它可以很好地控制引用。
例如，下面是你的工作示例:
import csv
data = ["value %d" % i for i in range(1,4)]
out = csv.writer(open("myfile.csv","w"), delimiter=',',quoting=csv.QUOTE_ALL)
out.writerow(data)
生产:
"value 1","value 2","value 3"
