Problems encountered in Python code and their solutions

One, for raw_input input characters for type judgment and conversion:

Raw_input input Default is a character, if the input is a numeric character, want to automatically convert, that is: input is a, do not operate, if the input is 3, that is converted to an integer.

You can use try: Except. method, let the program convert the value of raw_input () input to int, if the input is ' 23 ' is converted directly to the number 23, if the input is ' xx ' will try to fail and then run the except part.

#!/usr/bin/python27#_*_ coding:utf-8 _*_defMyint (s):Try: eval (s)## #eval将字符串str当成有效的表达式来求值并返回计算结果    exceptNameerror:## #名称错误        returnsexcept SyntaxError: # # #语法错误return S    Else:        returnEval (s) a= Raw_input ('Please input:')Print(Myint (a))

Special Note:

1, plus nameerror, can prevent the input string error:

Please INPUT:AAA
Traceback (most recent):
File "test.py", line +, in <module>
Print (Myint (a))
File "test.py", line 6, in Myint
Eval (s) # # #eval将字符串str当成有效的表达式来求值并返回计算结果
File "<string>", line 1, in <module>
Nameerror:name ' AAA ' is not defined

2, plus syntaxerror, can prevent input errors in Chinese:

Please input: China
Traceback (most recent):
File "test.py", line +, in <module>
Print (Myint (a))
File "test.py", line 6, in Myint
Eval (s) # # #eval将字符串str当成有效的表达式来求值并返回计算结果
File "<string>", line 1
China
^
Syntaxerror:invalid syntax

Second, in order to store in the dictionary or list in the Chinese comparison of the judgment, the following error occurred

ASCII codec can ' t decode byte 0xe8 in position 0:ordinal not in range (128)

1. Cause Analysis: Character issues.

2. Workaround: Add the following three lines to the problematic script:

Import Sys
Reload (SYS)
Sys.setdefaultencoding (' Utf-8 ')

Problems encountered in Python code and their solutions