output_SW.py
def countlines(filename):
    '''just returns number of lines in data'''
    with open(filename) as f:
        num = len(f.readlines())
        return(num)
just returns number of lines in data
just returns number of lines in data
just returns number of lines in data
def countlines(filename):
    with open(filename) as f:
        num = len(f.readlines())
        return(num)
def countlines ( filename ) : with open ( filename ) as f : num = len ( f . readlines ( ) ) return ( num )
just returns number of lines in data
just returns number of lines in data
'''just returns number of lines in data'''
filename