Python hushughulikia makosa kwa kutumia blocks za try/except, pamoja na else na finally za hiari. Python hukumbatia kanuni ya EAFP — "Easier to Ask Forgiveness than Permission" — ikipendelea kujaribu operesheni na kushughulikia exceptions badala ya kukagua masharti kwanza.
try:
result = risky_operation()
except ValueError as e: # catch a SPECIFIC exception type
print(f"bad value: {e}")
except (KeyError, IndexError): # catch multiple types
print("lookup failed")
except Exception as e: # catch-all (use sparingly, last)
print(f"unexpected: {e}")
else:
print("ran only if NO exception occurred")
finally:
cleanup() # ALWAYS runs (success or failure)
except SpecificError — nasa aina mahususi (inapendelewa kuliko catch-all tupu).else — huendeshwa tu ikiwa hakuna exception iliyotokea.finally — huendeshwa kila wakati (cleanup, kuachilia rasilimali), hata kama exception itasambaa.# LBYL ("Look Before You Leap") — check first
if key in my_dict:
value = my_dict[key]
# EAFP ("Easier to Ask Forgiveness") — try it, handle failure — more Pythonic
try:
value = my_dict[key]
except KeyError:
value = default
Python kiidiomatiki hupendelea EAFP — jaribu operesheni na unase exception — ambayo huepuka race conditions na mara nyingi ni safi kuliko kukagua kwanza.
if amount < 0:
raise ValueError("amount must be positive") # raise a built-in
class InsufficientFundsError(Exception): # custom exception type
pass
raise InsufficientFundsError("balance too low")
# ❌ bare except hides bugs (catches EVERYTHING, even typos/KeyboardInterrupt)
try: ...
except: pass
# ✅ catch specific exceptions; re-raise what you can't handle
try: ...
except ValueError as e:
logger.error(e)
raise # re-raise to propagate
✓ Catch SPECIFIC exceptions, not bare except
✓ Don't silently swallow errors (except: pass) — log or handle them
✓ Use finally / context managers (with) for cleanup
✓ Raise meaningful, specific exception types
Ushughulikiaji thabiti wa makosa ni muhimu kwa programu zinazotegemewa, na mbinu ya Python ina idiomu mahususi zinazostahili kujulikana: muundo wa try/except/else/finally, falsafa ya EAFP (jaribu-na-shughulikia badala ya kukagua-kwanza, ambayo ni ya Kipython zaidi na huepuka race conditions), kunasa exceptions mahususi (si except tupu, ambayo huficha bugs), na kutumia finally/context managers kwa cleanup.
Kuelewa haya huzuia kuanguka (crashes) kutokana na makosa yasiyoshughulikiwa na matatizo madogo, magumu kutatua yanayosababishwa na ushughulikiaji wa exception ulio mpana mno au wa kimya — chanzo cha mara kwa mara cha code isiyotegemewa.