Off topic:eliminating fields in a blastn file

Question

[Daniel James]

Get a blastn file with the output: Query id, Subject id, % identity, alignment length, e-value the following hits must be eliminated (1) hits to self (query=subject) (2) hits with less than 95% identity (3) hits with E-values greater than 0.1 Only the the total number of hits,the number of hits with an alignment length of less than 20 must be saved in a new file. need a python script for this.