Sample data:- Group Information: Name Target Status Role Mode Options SG_hpux_vgcgloack.r518634 s2976 Started Primary Sync auto_recover,auto_failover,path_management,auto_synchronize,active_active LocalVV ID RemoteVV ID SyncStatus LastSyncTime vgcglock_SG_cluster 13496 vgcglock_SG_cluster 28505 Synced NA Name Target Status Role Mode Options aix_rcg1_AA.r518634 s2976 Started Primary Sync auto_recover,auto_failover,path_management,auto_synchronize,active_active LocalVV ID RemoteVV ID SyncStatus LastSyncTime tpvvA_aix_r.2 20149 tpvvA_aix.2 41097 Synced NA tpvvA_aix_r.3 20150 tpvvA_aix.3 41098 Synced NA tpvvA_aix_r.4 20151 tpvvA_aix.4 41099 Synced NA Name Target Status Role Mode Options aix_rcg2_AA.r518634 s2976 Started Primary Sync auto_recover,auto_failover,path_management,auto_synchronize,active_active LocalVV ID RemoteVV ID SyncStatus LastSyncTime decoA_aix_r.11 20158 decoA_aix.11 41106 Synced NA decoA_aix_r.12 20159 decoA_aix.12 41107 Synced NA decoA_aix_r.13 20160 decoA_aix.13 41108 Synced NA
I want to search for line “Name” and the immediate next line and use it as Key: Value.
##The file is large and the code not shown here extract the data from Group Information line ##and saves to "no_extra_lines. # here i am removing the empty lines or empty strings no_extra_lines = [line for line in required_lines if line.strip() != ""] print(no_extra_lines) print(len(no_extra_lines)) #here i want to iterrate over the string and want to extract the line "Name" and the immedite next line. for num, line in enumerate(no_extra_lines): print(num, line) if "Name" in line: print(line) print(line +1)
How to print the line and the next line? OR to put it in another way, how can I extract the next set of lines after every occurrence of “Name”. The list is huge with the same pattern. I want to extract these 2 lines for every occurance and save as a key-value.
Since you have said that ‘The list is huge’, I would suggest to use an approach that uses iteration only and avoids indexing:
def extract_name_next(lines): it = (line for line in lines if line.strip() != '') for line in it: if line.startswith('Name'): key = line try: value = next(it) yield key, value except StopIteration: raise ValueError('Name must be followd by additional line')
This is a generator function that yields (key, value) pair. To print you can use it like
for key, value in extract_name_next(required_lines): print(key) print(value)
You could also construct a dict from these pairs:
mydict = dict(extract_name_next(required_lines))
Note that you could aswell use this generator to extract key,value pairs from e.g. a file, even if the file does not fit into RAM:
with open('huge_file') as file: mydict = dict(extract_name_next(file))