将一行分成多行，但使用python重复名称

Question

I have an input file (fixed width format) text file like this:

id1|col2|col3|...|timestamp1,timestamp2,timestamp3,timestamp4,timestamp5  
id2|col2|col3|...|timestamp1,timestamp2  
id3|col2|col3|...|timestamp1  
...  

IDs have different numbers of timestamps. The desired output should be structured as: each id should have one timestamp, 2nd timestamp should be on a different line with the same ids in front.

id1|col2|col3|...|timestamp1  
id1|col2|col3|...|timestamp2  
id1|col2|col3|...|timestamp3  
id1|col2|col3|...|timestamp4    
id1|col2|col3|...|timestamp5    
id2|col2|col3|...|timestamp1  
id2|col2|col3|...|timestamp2  
id3|col2|col3|...|timestamp1  

I have tried to read it in sql, but it is kind of tedious. I am looking to see if there is an answer in Python or unix. Thanks a lot.

Answer 1

You can use split('|') to cut your line using | delimiter, and then split(',') to cut the final field into a list of timestamps

with open('/path/to/file', 'r') as f:  
    for line in f:
        fields = line.split('|')
        timestamps = fields[-1].split(',')
        for timestamp in timestamps:
            print('|'.join(fields[:-1]+[timestamp]))