为什么 Try 块在 Python3 中执行 except 块之前重新调整 SyntaxError？

Question

Here I am trying to print "Invalid text" when the string contains Backslash " \ ". I know that in Python strings, the backslash " \ " is a special character called the "escape" character. But when python tries to read the variable s, it returns SyntaxError.

try:
     s = '\'
except:
    print("Invalid text")

output is

File "C:\Users\Admin\PycharmProjects\pythonProject19\main.py", line 4
    raise SyntaxError if s = '\':
                              ^
SyntaxError: unterminated string literal (detected at line 4)

Answer 1

Because of \ , your code should be as the following.

try:
     s == '\\'
except:
    print("Invalid text")

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Read more about Python Escape Characters here: https://www.w3schools.com/python/gloss_python_escape_characters.asp

Answer 2

You have an unterminated string literal.The proper way to terminate a string literal as is described by you in this instance is s == '\\' .