Merge pull request #3406 from erfanio/f-string-docs

Change docs to use f-strings

docs/patterns/fabric.rst

@@ -49,16 +49,16 @@ virtual environment::
     def deploy():
         # figure out the package name and version
         dist = local('python setup.py --fullname', capture=True).strip()
-        filename = '%s.tar.gz' % dist
+        filename = f'{dist}.tar.gz'
 
         # upload the package to the temporary folder on the server
-        put('dist/%s' % filename, '/tmp/%s' % filename)
+        put(f'dist/{filename}', f'/tmp/{filename}')
 
         # install the package in the application's virtualenv with pip
-        run('/var/www/yourapplication/env/bin/pip install /tmp/%s' % filename)
+        run(f'/var/www/yourapplication/env/bin/pip install /tmp/{filename}')
 
         # remove the uploaded package
-        run('rm -r /tmp/%s' % filename)
+        run(f'rm -r /tmp/{filename}')
 
         # touch the .wsgi file to trigger a reload in mod_wsgi
         run('touch /var/www/yourapplication.wsgi')

docs/patterns/sqlalchemy.rst

@@ -86,7 +86,7 @@ Here is an example model (put this into :file:`models.py`, e.g.)::
             self.email = email
 
         def __repr__(self):
-            return '<User %r>' % (self.name)
+            return f'<User {self.name!r}>'
 
 To create the database you can use the `init_db` function:
 
@@ -159,7 +159,7 @@ Here is an example table and model (put this into :file:`models.py`)::
             self.email = email
 
         def __repr__(self):
-            return '<User %r>' % (self.name)
+            return f'<User {self.name!r}>'
 
     users = Table('users', metadata,
         Column('id', Integer, primary_key=True),

docs/patterns/viewdecorators.rst

@@ -82,11 +82,11 @@ Here the code::
     from functools import wraps
     from flask import request
 
-    def cached(timeout=5 * 60, key='view/%s'):
+    def cached(timeout=5 * 60, key='view/{}'):
         def decorator(f):
             @wraps(f)
             def decorated_function(*args, **kwargs):
-                cache_key = key % request.path
+                cache_key = key.format(request.path)
                 rv = cache.get(cache_key)
                 if rv is not None:
                     return rv