在Python中验证txt文件(tsv)的前3行

Question

我一直在尝试为上传到我的环境中的txt文件构建一个验证规则。文件以制表符分隔，我需要验证前3行的格式，例如：

## This Text Here 
## This Text Here
## This Text Here

我需要建立一个通过-失败验证。到目前为止，我已经尝试过在python中使用内置的csv函数来实现这一点，但没有成功。如果能就最佳路线提供任何建议，我将不胜感激。

Answer 1

试试这个：

### it depends on how you open the file but...
# open using with..
with open("test.tsv") as inData:
# split lines on tabs...
allLines = [l.split("t") for l in inData]
# get the lines in question:
testLines = [l[0] for l in allLines[:3]]
# then you could use assert
for l in testLines:
assert(l.startswith("##"))
# and whatever other validation you need for the string
### you could ad try/except
try:
for l in testLines:
assert(l.startswith("##"))
except AssertionError as e:
print(e, "please use a validated file!")

进一步阅读：https://www.tutorialspoint.com/python/python_exceptions.htm

Answer 2

也许你应该试试熊猫：

import pandas as pd
file_name = # your file name
csv = pd.read_csv(file_name, sep='t')
# do your stuff

文件：https://pandas.pydata.org/pandas-docs/stable/reference/api/pandas.read_csv.html