从文件python读取时的不同文本

Question

I am using Python 2.7

The text I get from reading a file is different from the text I assign directly to a variable.

import unittest
class test_things(unittest.TestCase):
    def test_bad_read_stack_overflow(self):
        text_var = """[] Lorem Ipsum Lorem Ipsum Lorem Ipsum
Lorem Ipsum
Lorem Ipsum Lorem Ipsum Lorem Ipsum
*** Lorem Ipsum

Lorem Ipsum Lorem Ipsum Lorem Ipsum
Lorem Ipsum Lorem Ipsum
Lorem Ipsum Lorem Ipsum ** []

Lorem Ipsum
* Lorem IpsumLorem Ipsum
Lorem IpsumLorem IpsumLorem Ipsum
[] Lorem Ipsum
Lorem Ipsum
Lorem IpsumLorem Ipsum



        """

        import io
        text_file = io.open("unittest_data/example_for_stack_overflow", "r", encoding="utf-8").read()

        self.assertEqual(text_var, text_file)

The assertion fails.

In the file, "example_for_stack_overflow" I have this:

---

[] Lorem Ipsum Lorem Ipsum Lorem Ipsum
Lorem Ipsum
Lorem Ipsum Lorem Ipsum Lorem Ipsum
*** Lorem Ipsum

Lorem Ipsum Lorem Ipsum Lorem Ipsum
Lorem Ipsum Lorem Ipsum
Lorem Ipsum Lorem Ipsum ** []

Lorem Ipsum
* Lorem IpsumLorem Ipsum
Lorem IpsumLorem IpsumLorem Ipsum
[] Lorem Ipsum
Lorem Ipsum
Lorem IpsumLorem Ipsum

---

For clarity, because here it doesn't appear, there are 4 \\n characters at the end.

... IpsumLorem Ipsum\\n\\n\\n\\n

It's the exact same text I have assigned to text_var .

Why is this problem occurring and how can I fix it?

Thanks!

Answer 1

Have you examined the error message in detail?

AssertionError: '[] L[279 chars]rem Ipsum\nLorem Ipsum\nLorem IpsumLorem Ipsum\n\n\n\n        ' != '[] L[279 chars]rem Ipsum\nLorem Ipsum\nLorem IpsumLorem Ipsum\n\n\n\n'

There are a couple of spaces at the end of the string ( '[...]\\n\\n ' ) that are not in the file ( '[...]\\n\\n' ).

When you close the string the spaces in front of """ are included. This should work:

    def test_bad_read_stack_overflow(self):
        text_var = """[] Lorem Ipsum Lorem Ipsum Lorem Ipsum
Lorem Ipsum
Lorem Ipsum Lorem Ipsum Lorem Ipsum
*** Lorem Ipsum

Lorem Ipsum Lorem Ipsum Lorem Ipsum
Lorem Ipsum Lorem Ipsum
Lorem Ipsum Lorem Ipsum ** []

Lorem Ipsum
* Lorem IpsumLorem Ipsum
Lorem IpsumLorem IpsumLorem Ipsum
[] Lorem Ipsum
Lorem Ipsum
Lorem IpsumLorem Ipsum



"""

Answer 2

(shrug) somewhere your file text is not the same as the variable text.

Make sure they are identical by

with open("unittest_data/example_for_stack_overflow", "w") as outf:
    outf.write(text_var)

then run your code again and it should work.