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The backslash escape characters with special meanings. n becomes a newline \n, and quotes becomes a character without the ‘end the string’ meaning the quote normal gets inside a string, if the string began with the same kind of quote. So it becomes an ordinary character with a backslash \" . s0 = "\"" becomes a string with one character: len(s0) = 1 and print(s0) gives: " There is nothing special with “ (duoble qoute) comparing to ‘ (singel quote). So to enclose a number in quotes you can escape them: s1 = "\"42\"" or: s2 = '"42"' In the last one the string starts and ends with single qutoes, so the double quotes becomes ordinary characters inside the string.
This line doesn't produce errors. It is okay as it is: print('I\'m learning Python!') This line was producing an error. print("A number enclosed in double quotes: "42"") The corrected syntax is as follows: print("A number enclosed in double quotes: \"42\"")