[英]Python pandas read file, write to excel
I have a file like this : 我有一个像这样的文件:
SOME_INFO_BEGIN
....
....
SOME_INFO_END
ACTUAL_DETAIL_BEGIN
TEST|1|23|abcd|
TEST|2|5|efgs|
TEST|3|124|zyz|
ACTUAL_DETAIL_END
I only to read the lines between ACTUAL_DETAILS_BEGIN and ACTUAL_DETAILS_END and they will always start with TEST, however i also only to read the line which has 5 in the 3rd column. 我只阅读ACTUAL_DETAILS_BEGIN和ACTUAL_DETAILS_END之间的行,它们始终以TEST开头,但是我也只阅读第3列中包含5的行。
The below code works for me except it gets all the 3 lines - 下面的代码对我有用,除了它获得了所有3行-
with open(dir+filename, 'r') as filehandle:
filecontent = filehandle.readlines()
ifa = [k for k in filecontent if 'TEST' in k]
df = pd.DataFrame([sub.split("|") for sub in ifa])
df.columns= ['Type','Amt','Desc','Value1','Value2']
df1 = df[['Type','Desc']]
print(df1)
df1.to_excel (dir+"test.xlsx", index = False)
Q1. Q1。 Is there a better way to code this ?
有没有更好的方法编写此代码? For eg.
例如。 how is the filehandle closed for excel write?
如何关闭excel写的文件句柄?
Q2. Q2。 How do i only pick up the 2nd row ?
我如何只接第二排?
Nothing to test with but you can iterate files and lazily load the lines. 没什么可测试的,但是您可以迭代文件并延迟加载行。 Perhaps this is more efficient:
也许这样更有效:
rebuilt = []
with open(dir+filename, 'r') as infile:
for row in infile:
if row[:4] == 'TEST':
rebuild.append(row.split('|'))
df = pd.DataFrame(rebuilt, columns= ['Type','Amt','Desc','Value1','Value2'])
readlines()
is going to load the whole thing into memory, regardless, so you can filter the lines as you read them instead. 无论如何,
readlines()
整个内容加载到内存中,因此您可以在读取行时对其进行过滤。 You're also splitting each line before checking a condition, so it may be faster to check against a list slice. 您还需要在检查条件之前对每一行进行拆分,因此根据列表切片进行检查可能会更快。
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