Python's basic usage
try:
<语句块1>
except:
<语句块2>
except:
<语句块3>
Python's Advanced Usage
try:
<语句块1>
except:
<语句块2>
else:
<语句块3>
finally:
<语句块4>
Meaning try-except unchanged advanced use, except can have multiple sets. else if the try bonus when no abnormality <statement block 1>. finally the content that must be executed. This combination of four reserved words you can cope with all situations. Statement abnormality has not occurred, then execution path is 1-> 3-> 4. And vice versa is 1-> 2-> 4
Advanced usage of Python usage in the function of
def f(a):
try:
print(1/a)
rerturn 1/a
except:
print("except")
rerturn "except"
else:
print("else")
rerturn "else"
finally:
print("finally")
rerturn "finally"
At this convention: regardless of return occur in any place, as long as there is finally in exception handling you must want to finally statements to the function returns executed.
>>>f(1)
1.0
fiinally
'finally'
>>>f(0)
except
finally
'finally'
Because there return in the try, even if there is no abnormality, the function will be executed before finally lead to the return of the statement.
