Simply place the YS_Chat_v0.1.py file into a directory with .yfs files and run it. All files will be parsed, so a folder with only a few .yfs files is recommended.
Tested with Python 3.4.2. Your mileage may vary with other versions of python.
Download from BitBucket
21.26 - [XMS-121] Swiftteehhhhhh has left the airplane.
22.77 - MD5Ray01 took off ([241ST]AERO_L-39_ALBATROS)
26.79 - [XMS-121] Swiftteehhhhhh took off ([GRUNSOL/8TFS]A/F-10Z_ADVANCED_W)
29.46 - [VFA-49]Ace Lord took off ([VFA-49]B-1R_LANCER[DV3_FIREBALL)
30.37 - MD5Ray01 has left the airplane.
57.66 - ** Log-on process completed **
65.76 - MD5Ray01 took off (WW-04_WARHAWK)
97.00 - Decaff_42 took off ([VT-171]F/A-18C_HORNET)
127.50 - MD5Ray01 has left the airplane.
129.69 - MD5Ray01 took off (WW-04_WARHAWK)
135.95 - ouga8888 took off (F-15DJ_72-8090(HIKOKYODOTAI)[ICE)
143.68 - SATSUI_NO_HADO took off ([8TFS-GRUN-FGTR/ATKR]_F-15E_STRI)
153.85 - MD5Ray01 has left the airplane.