Why does Python write "else" for try-else?

When should I write else in try- statement? There seems to be no difference between codes 1, 2, and 3 below

If the else statement is executed when no error occurs in the try statement, Can't you just not write else or keep writing it under the try statement?

#1
try:
    A = 3
except:
    pass #handler
else:
    A = 5

#2
try:
    A = 3
    A = 5
except :
    pass #handler

#3
try:
    A = 3
except
    pass #handler
A = 5

python exception-handling

2022-09-22 22:27

1 Answers

According to Handling Exceptions

Writing the else statement is better than writing additional code in the try statement. I'll explain it in the following cases.

#Code1 - else statements are written
try:
    open("myfile.txt")
except :
    print "IOError!"
else:
    print "all fine!"

    n = int(input())
    print 1/n

#Code2 - When written in try
try:
    open("myfile.txt")
    n = int(input())
    print 1/n

except :
    print "IOError!"
else:
    print "all fine!"

The programmer wrote the code with the intention of making an exception only when "myfile.txt" was not present However, since code 2 has print 1/n in try, if zeroDivisionError occurs, this also proceeds to the exception handling step. Therefore, it is possible to prevent accidental exception handling by putting a code that does not want exception handling in the else statement like code 1.

2022-09-22 22:27

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