我有〜1000个文件,带有一个两列数组,行数不同,扩展名为.csv。我需要读取文件的每一行,跳过第一个标题行,然后将所有内容写为制表符分隔的.txt文件。我试过在python中写这个。我想改变numbers.csv
X,Y
1,2
3,4
...
成
1[tab]2
3[tab]4
...
我的代码如下。
在“下一个(csv_file)”操作中,我的程序正在读取错误“StopIteration”,infile的内容被删除。如果我从我的代码中删除这一行,我仍然覆盖了文件内的内容,但对外部文件没有任何作用。
有人可以帮助我实现这一目标吗? `
import csv
import os
cwd = os.getcwd()
#print(cwd)
for file in os.listdir():
file_name, file_ext = os.path.splitext(file)
if file_ext == '.csv':
with open(file,'r') as csv_file:
csv_reader = csv.reader(csv_file)
next(csv_file)
for line in csv_reader:
with open(file, 'w') as new_txt: #new file has .txt extension
txt_writer = csv.writer(line, delimiter = '\t') #writefile
txt_writer.writerow(line) #write the lines to file`
你走在正确的轨道上。我对您的代码进行了一些更改:
import csv
import os
cwd = os.getcwd()
#print(cwd)
for file in os.listdir('.'): # use the directory name here
file_name, file_ext = os.path.splitext(file)
if file_ext == '.csv':
with open(file,'r') as csv_file:
csv_reader = csv.reader(csv_file)
csv_reader.next() ## skip one line (the first one)
newfile = file + '.txt'
for line in csv_reader:
with open(newfile, 'a') as new_txt: #new file has .txt extn
txt_writer = csv.writer(new_txt, delimiter = '\t') #writefile
txt_writer.writerow(line) #write the lines to file`
在写作中,你需要使用'a'(追加)代替'w'(写),否则,你只需要一行 - 最后一行。并且,如果最后一行是一个空行,那么你所拥有的只是一个空白的文件,即什么都没有。
In[2]: import csv
In[3]: with open('test_file.txt', 'r') as f:
...: for line in f:
...: print(line)
...:
X,Y
1,2
3,4
In[4]: with open('test_file.txt', 'r') as f:
...: reader = csv.DictReader(f)
...: fieldnames = reader.fieldnames
...: result = list(reader)
...:
...: with open('test_output.tsv', 'w') as f:
...: writer = csv.DictWriter(f, fieldnames=fieldnames, delimiter='\t')
...: writer.writeheader() # remove this line if you don't want header
...: writer.writerows(result)
...:
In[5]: with open('test_output.tsv', 'r') as f:
...: for line in f:
...: print(line)
...:
X Y
1 2
3 4