[英]Printing to a CSV file using Python
I need to print headers and data rows to a CSV file. 我需要将标题和数据行打印到CSV文件中。 Here is my code: 这是我的代码:
import csv
import sys
with open(r'C:\Users\testuser\Desktop\raw_inpuy.csv','rb') as csvfile:
reader=csv.reader(csvfile,delimiter=',')
first=True
data={}
for row in reader:
if first:
first= False
continue
if not int(row[1]) in data:
data[int(row[1])]=[]
data[int(row[1])].append(float(row[3]))
with open (r'C:\Users\testuser\Desktop\outcome.csv','wb') as f_out:
outwriter=csv.writer(f_out,delimiter=',')
f_out.write(";".join(['Size','S1','S2','S3','S4']))
for item in data:
row=[item]
row.extend(data[item])
f_out.write(";".join(map(str,row)))
I get this error: 我收到此错误:
**ERROR Expected a character buffer obj**
You should feed writer.write
with an str
not a list
: 您应该使用不是list
的str
来提供writer.write
:
writer.write(";".join(['Size','S1','S2','S3','S4']))
also: 也:
writer.write(";".join(map(str, row)))
Instead of trying to build your own CSV records, let the csv
module handle it. 与其尝试构建自己的CSV记录, csv
让csv
模块处理它。 Like this: 像这样:
import csv
data = [[10, 'foo', 'bar', 'blue', 'green'],
[20, 'bar', 'foo', 'blue', 'green'],
[30, 'ba', 'bar', 'red', 'white']]
with open (r'C:\Users\testuser\Desktop\outcome.csv','w') as file:
writer = csv.writer(file)
writer.writerow(['Size','S1','S2','S3','S4'])
for row in data:
writer.writerow(row)
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