Replace % with f-strings in multiple files mentioned in issue #19 (#41)

Author: tusharkhatriofficial

advanced/functions.md

@@ -50,7 +50,7 @@ For example, instead of this...
 
 ```python
 def get_new_info(username):
-    print("Changing user information of %s." % username)
+    print(f"Changing user information of {username}.")
     username = input("New username: ")
     password = input("New password: ")
     fullname = input("Full name: ")
@@ -66,7 +66,7 @@ class User:
     # them here
 
     def change_info(self):
-        print("Changing user information of %s." % self.username)
+        print(f"Changing user information of {self.username}.")
         self.username = input("New username: ")
         self.password = input("New password: ")
         self.fullname = input("Full name: ")

advanced/magicmethods.md

@@ -112,13 +112,10 @@ the message is 'hello'
 
 Combining `repr()` with [string
 formatting](../basics/handy-stuff-strings.md#string-formatting) is also
-easy. `%` formatting has a `%r` formatter, and `.format()` formatting
-has a `!r` flag.
+easy.
 
 ```python
->>> print("the message is %r" % (message,))
-the message is 'hello'
->>> print("the message is {!r}".format(message))
+>>> print(f"the message is {repr(message)}")
 the message is 'hello'
 >>>
 ```
@@ -155,8 +152,7 @@ follow one of these styles:
     ...         self.name = name
     ...         self.founding_year = founding_year
     ...     def __repr__(self):
-    ...         return 'Website(name=%r, founding_year=%r)' % (
-    ...             self.name, self.founding_year)
+    ...         return f'Website(name={repr(self.name)}, founding_year={repr(self.founding_year)})'
     ...
     >>> github = Website('GitHub', 2008)
     >>> github
@@ -174,8 +170,7 @@ follow one of these styles:
     ...         self.name = name
     ...         self.founding_year = founding_year
     ...     def __repr__(self):
-    ...         return '<Website %r, founded in %r>' % (
-    ...             self.name, self.founding_year)
+    ...         return f'<Website {repr(self.name)}, founded in {repr(self.founding_year)}>'
     ...
     >>> github = Website('GitHub', 2008)
     >>> github

basics/answers.md

@@ -100,16 +100,7 @@ isn't exactly like mine but it works just fine it's ok, and you can
     just fine if we run it, but there's a problem. The last line is
     really long and it's hard to see what it does.
 
-    The solution is string formatting. At the time of writing this, I
-    recommend replacing the last line with one of these:
-
-    ```python
-    print("You entered %s, %s, %s and %s." % (word1, word2, word3, word4))
-    print("You entered {}, {}, {} and {}.".format(word1, word2, word3, word4))
-    ```
-
-    In the future when most people will have Python 3.6 or newer, you
-    can also use this:
+    The solution is string formatting. I recommend replacing the last line with this:
 
     ```python
     print(f"You entered {word1}, {word2}, {word3} and {word4}.")

basics/defining-functions.md

@@ -510,7 +510,7 @@ colors = ['red', 'yellow', 'blue', 'green', 'orange', 'pink', 'black',
           'gray', 'white', 'brown']
 choice = ask_until_correct("What's your favorite color?", colors,
                            error_message="I don't know that color.")
-print("Your favorite color is %s!" % choice)
+print(f"Your favorite color is {choice}!")
 ```
 
 ## Summary

basics/exceptions.md

@@ -249,9 +249,9 @@ text = input("Enter a number: ")
 try:
     number = int(text)
 except ValueError:
-    print("'%s' is not a number." % text, file=sys.stderr)
+    print(f"'{text}' is not a number.", file=sys.stderr)
     sys.exit(1)
-print("Your number doubled is %d." % (number * 2))
+print(f"Your number doubled is {(number * 2)}.")
 ```
 
 ## Raising exceptions
@@ -452,7 +452,7 @@ def greet():
 try:
     greet()
 except OSError:
-    print("Cannot read '%s'!" % filename, file=sys.stderr)
+    print(f"Cannot read '{filename}'!", file=sys.stderr)
     if askyesno("Would you like to create a default greeting file?"):
         with open(filename, 'w') as f:
             print(default_greeting, file=f)

basics/larger-program.md

@@ -82,7 +82,7 @@ def ask_questions(answers):
             print("Correct!")
             correct.append(question)
         else:
-            print("Wrong! The correct answer is %s." % answer)
+            print(f"Wrong! The correct answer is {answer}.")
             wrong.append(question)
 
     return (correct, wrong)
@@ -181,11 +181,11 @@ def ask_questions(answers):
     wrong = []
 
     for question, answer in answers.items():
-        if input('%s = ' % question).strip() == answer:
+        if input(f'{question} = ').strip() == answer:
             print("Correct!")
             correct.append(question)
         else:
-            print("Wrong! The correct answer is %s." % answer)
+            print(f"Wrong! The correct answer is {answer}.")
             wrong.append(question)
 
     return (correct, wrong)

basics/loops.md

@@ -416,7 +416,7 @@ while True:
             print("I don't know anybody yet.")
         else:
             for name in namelist:
-                print("I know %s!" % name)
+                print(f"I know {name}!")
 
     else:
         print("I don't understand :(")