GH-46: Add flake8 config

- Format mdutils source files.
- Format mdutils tests files.

.flake8

@@ -0,0 +1,6 @@
+[flake8]
+max-line-length = 120
+exclude =
+    .git,
+	build,
+	dist

.vscode/settings.json

@@ -3,5 +3,6 @@
         "tests"
     ],
     "python.testing.unittestEnabled": false,
-    "python.testing.pytestEnabled": true
+    "python.testing.pytestEnabled": true,
+    "python.formatting.provider": "black"
 }

codecov.yml

@@ -3,4 +3,8 @@ coverage:
     project:
       default:
         target: 80%    # the required coverage value
-        threshold: 1%
+        threshold: 5%
+    patch:
+      default:
+        target: 80%
+        threshold: 5%

mdutils/fileutils/fileutils.py

@@ -7,6 +7,7 @@
 # MIT License: (C) 2018 Dídac Coll
 from typing import Optional
 
+
 class MarkDownFile(object):
     """MarkDownFile class creates a new file of MarkDown extension.
 
@@ -15,49 +16,56 @@ class MarkDownFile(object):
         - Rewrite a file with new data.
         - Write at the end of the file."""
 
-    def __init__(self, name='', dirname: Optional[str] = None):
+    def __init__(self, name="", dirname: Optional[str] = None):
         """Creates a markdown file, if name is not empty.
         :param str name: provide the file name or a path joinly with the file name. For example: `./my-path/my-file.md`.
-        :param str dirname: use dirname if you want to provide the path separately from the name. 
+        :param str dirname: use dirname if you want to provide the path separately from the name.
         If not you can specify the path directly on the name."""
         if name:
             self.dirname = dirname
             self.file_name = self._get_file_name(name, dirname)
-            self.file = open(f'{self.file_name}', 'w+', encoding='UTF-8')
+            self.file = open(f"{self.file_name}", "w+", encoding="UTF-8")
             self.file.close()
 
-    def _get_file_name(self, name: str, dirname: Optional[str] = None ) -> str:
-            if dirname:
-                return f'{dirname}/{name}' if name.endswith('.md') else f'{dirname}/{name}.md'
-
-            return name if name.endswith('.md') else f'{name}.md'
+    def _get_file_name(self, name: str, dirname: Optional[str] = None) -> str:
+        if dirname:
+            return (
+                f"{dirname}/{name}" if name.endswith(".md") else f"{dirname}/{name}.md"
+            )
+
+        return name if name.endswith(".md") else f"{name}.md"
 
     def rewrite_all_file(self, data: str):
         """Rewrite all the data of a Markdown file by ``data``.
 
-        :param str data: is a string containing all the data that is written in the markdown file."""
-        with open(f'{self.file_name}', 'w', encoding='utf-8') as self.file:
+        :param str data: is a string containing all the data that is written in the markdown file.
+        """
+        with open(f"{self.file_name}", "w", encoding="utf-8") as self.file:
             self.file.write(data)
 
     def append_end(self, data: str):
         """Write at the last position of a Markdown file.
 
-        :param str data: is a string containing all the data that is written in the markdown file."""
-        with open(f'{self.file_name}', 'a', encoding='utf-8') as self.file:
+        :param str data: is a string containing all the data that is written in the markdown file.
+        """
+        with open(f"{self.file_name}", "a", encoding="utf-8") as self.file:
             self.file.write(data)
 
     def append_after_second_line(self, data: str):
         """Write after the file's first line.
 
-        :param str data: is a string containing all the data that is written in the markdown file."""
-        with open(f'{self.file_name}', 'r+', encoding='utf-8') as self.file:
+        :param str data: is a string containing all the data that is written in the markdown file.
+        """
+        with open(f"{self.file_name}", "r+", encoding="utf-8") as self.file:
             file_data = self.file.read()  # Save all the file's content
             self.file.seek(0, 0)  # Place file pointer at the beginning
             first_line = self.file.readline()  # Read the first line
             second_line = self.file.readline()  # Read the second line
-            self.file.seek(len(first_line + second_line), 0)  # Place file pointer at the end of the first line
+            self.file.seek(
+                len(first_line + second_line), 0
+            )  # Place file pointer at the end of the first line
             self.file.write(data)  # Write data
-            self.file.write('\n' + file_data[len(first_line + second_line):])
+            self.file.write("\n" + file_data[len(first_line + second_line):])
 
     @staticmethod
     def read_file(file_name: str) -> str:
@@ -68,15 +76,15 @@ def read_file(file_name: str) -> str:
         :return: return all file's data.
         :rtype: str"""
 
-        if file_name.find('.md') == -1:
-            file_name += '.md'
+        if file_name.find(".md") == -1:
+            file_name += ".md"
 
-        with open(file_name, 'r', encoding='utf-8') as file:
+        with open(file_name, "r", encoding="utf-8") as file:
             file_data = file.read()
 
         return file_data
 
 
-if __name__ == '__main__':
-    new_file = MarkDownFile('Example')
+if __name__ == "__main__":
+    new_file = MarkDownFile("Example")
     new_file.rewrite_all_file(data="# Some Text Example")