Python trace 神器之一

Wed, 16 Jun 2021 20:41:00 +0800

遇到 Exception 但不知道哪邊或是 root cause

發現 stackprinter 真的是很棒

來看看範例

import stackprinter

a = [10, 4, 3, 9, 22, "0"]
try:
 b = [i for i in a if 100 % i == 0]

except Exception as e:
 print(e)
 stackprinter.show()

執行後顯示

unsupported operand type(s) for %: 'int' and 'str'
File "U:/PY/practice/exception.py", line 12, in <module>
 8 # with stackprinter.TracePrinter(style='darkbg2'):
 9 # b = [i for i in a if 100 % i == 0]
 10 
 11 try:
--> 12 b = [i for i in a if 100 % i == 0]
 13 
 ..................................................
 a = [10, 4, 3, 9, 22, '0', ]
 ..................................................

File "U:/PY/practice/exception.py", line 12, in <listcomp>
 8 # with stackprinter.TracePrinter(style='darkbg2'):
 9 # b = [i for i in a if 100 % i == 0]
 10 
 11 try:
--> 12 b = [i for i in a if 100 % i == 0]
 13 
 ..................................................
 i = '0'
 a = [10, 4, 3, 9, 22, '0', ]
 ..................................................

TypeError: unsupported operand type(s) for %: 'int' and 'str'

如果還沒 try except 更推薦用

with stackprinter.TracePrinter(style='darkbg2'):
 something()

結果顯示如下 (雖然有點攏長，但是色彩很棒~)

File "U:/PY/practice\exception.py", line 9, in <module>
 5 
 6 a = [10, 4, 3, 9, 22, "0"]
 7 
 8 with stackprinter.TracePrinter(style='darkbg2'):
--> 9 b = [i for i in a if 100 % i == 0]
 10 
 ..................................................
 a = [10, 4, 3, 9, 22, '0', ]
 stackprinter.TracePrinter = <class 'stackprinter.tracing.TracePrinter'>
 ..................................................

 └──┐
 File "U:/PY/practice\exception.py", line 9, in <listcomp>
 5 
 6 a = [10, 4, 3, 9, 22, "0"]
 7 
 8 with stackprinter.TracePrinter(style='darkbg2'):
 --> 9 b = [i for i in a if 100 % i == 0]
 10 
 ..................................................
 a = [10, 4, 3, 9, 22, '0', ]
 stackprinter.TracePrinter = <class 'stackprinter.tracing.TracePrinter'>
 ..................................................
 
 File "U:/PY/practice\exception.py", line 9, in <listcomp>
 5 
 6 a = [10, 4, 3, 9, 22, "0"]
 7 
 8 with stackprinter.TracePrinter(style='darkbg2'):
 --> 9 b = [i for i in a if 100 % i == 0]
 10 
 ..................................................
 a = [10, 4, 3, 9, 22, '0', ]
 stackprinter.TracePrinter = <class 'stackprinter.tracing.TracePrinter'>
 i = '0'
 ..................................................
 
 TypeError: unsupported operand type(s) for %: 'int' and 'str'
File "U:/PY/practice\exception.py", line 9, in <module>
 5 
 6 a = [10, 4, 3, 9, 22, "0"]
 7 
 8 with stackprinter.TracePrinter(style='darkbg2'):
--> 9 b = [i for i in a if 100 % i == 0]
 10 
 ..................................................
 a = [10, 4, 3, 9, 22, '0', ]
 stackprinter.TracePrinter = <class 'stackprinter.tracing.TracePrinter'>
 ..................................................

File "U:/PY/practice\exception.py", line 9, in <listcomp>
 5 
 6 a = [10, 4, 3, 9, 22, "0"]
 7 
 8 with stackprinter.TracePrinter(style='darkbg2'):
--> 9 b = [i for i in a if 100 % i == 0]
 10 
 ..................................................
 a = [10, 4, 3, 9, 22, '0', ]
 stackprinter.TracePrinter = <class 'stackprinter.tracing.TracePrinter'>
 i = '0'
 ..................................................

TypeError: unsupported operand type(s) for %: 'int' and 'str'

Stackprinter on 布萊恩 | QA job | Testing

Python trace 神器之一

遇到 Exception 但不知道哪邊或是 root cause

發現 stackprinter 真的是很棒

來看看範例

執行後顯示

如果 還沒 try except 更推薦用

結果顯示如下 (雖然有點攏長，但是色彩很棒~)

如果還沒 try except 更推薦用