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+--- Thread: code copy from pep-3134 (/thread-12466.html)
code copy from pep-3134 - bluefrog - Aug-26-2018
I'm attempting to run the snippet of code in PEP-3134, but I'm not getting the errors stated.
The code relates to implicit exception handling. The expectation, according to the PEP, is:
Quote:The ultimate result will be an AttributeError due to the misspelling of clos, whose __context__ points to a NameError due to the misspelling of ex, whose __context__ points to an IOError due to the file being read-only, whose __context__ points to a ZeroDivisionError, whose __context__ attribute is None.
#!/usr/bin/python3
def main(filename):
file = open(filename) # oops, forgot the 'w'
try:
try:
compute()
except Exception, exc:
log(file, exc)
finally:
file.clos() # oops, misspelled 'close'
def compute():
1/0
def log(file, exc):
try:
print >>file, exc # oops, file is not writable
except:
display(exc)
def display(exc):
print ex # oops, misspelled 'exc'
if __name__ == "__main()__":
main('t.txt')I get the following syntax error instead of what is expected:Error: File "./exception_chaining.py", line 5
try:
^
IndentationError: unexpected indentRE: code copy from pep-3134 - snippsat - Aug-26-2018
(Aug-26-2018, 02:59 PM)bluefrog Wrote: Can anybody suggest why ?Indentation is wrong on web-site,so have to fix that.
Here also a fix so it work Python 3.6 -->.
def main(filename):
file = open(filename) # oops, forgot the 'w'
try:
try:
compute()
except Exception as exc:
log(file, exc)
finally:
file.clos() # oops, misspelled 'close'
def compute():
1/0
def log(file, exc):
try:
print >>file, exc # oops, file is not writable
except:
display(exc)
def display(exc):
print(ex) # oops, misspelled 'exc'
main('result.csv')Output:λ python 394.py
Traceback (most recent call last):
File "394.py", line 5, in main
compute()
File "394.py", line 12, in compute
1/0
ZeroDivisionError: division by zero
During handling of the above exception, another exception occurred:
Traceback (most recent call last):
File "394.py", line 16, in log
print >>file, exc # oops, file is not writable
TypeError: unsupported operand type(s) for >>: 'builtin_function_or_method' and '_io.TextIOWrapper'. Did you mean "print(<message>, file=<output_stream>)"?
During handling of the above exception, another exception occurred:
Traceback (most recent call last):
File "394.py", line 7, in main
log(file, exc)
File "394.py", line 18, in log
display(exc)
File "394.py", line 21, in display
print(ex) # oops, misspelled 'exc'
NameError: name 'ex' is not defined
During handling of the above exception, another exception occurred:
Traceback (most recent call last):
File "394.py", line 23, in <module>
main('result.csv')
File "394.py", line 9, in main
file.clos() # oops, misspelled 'close'
AttributeError: '_io.TextIOWrapper' object has no attribute 'clos'