diff --git a/huffman_py/functions/calculate_code.py b/huffman_py/functions/calculate_code.py
new file mode 100644
index 0000000..3841a3f
--- /dev/null
+++ b/huffman_py/functions/calculate_code.py
@@ -0,0 +1,39 @@
+#
+#     Sam Hadow - Huffman-py
+#     Copyright (C) 2023
+#
+#     This program is free software: you can redistribute it and/or modify
+#     it under the terms of the GNU General Public License as published by
+#     the Free Software Foundation, either version 3 of the License, or
+#     (at your option) any later version.
+#
+#     This program is distributed in the hope that it will be useful,
+#     but WITHOUT ANY WARRANTY; without even the implied warranty of
+#     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+#     GNU General Public License for more details.
+#
+#     You should have received a copy of the GNU General Public License
+#     along with this program.  If not, see <http://www.gnu.org/licenses/>.
+#
+def calculate_code(node, value = '', the_codes = None):
+        # Create code Dict if it doesn't exist yet (before recursion)
+        if the_codes == None:
+            the_codes = dict()
+
+            # handle the case with a single node (0 as default value)
+            if(not node.left and not node.right):
+                the_codes[node.char] = "0"
+                return the_codes
+
+        # actual node code
+        newValue = value + str(node.code)
+
+        if(node.left):
+            calculate_code(node.left, newValue, the_codes)
+        if(node.right):
+            calculate_code(node.right, newValue, the_codes)
+
+        if(not node.left and not node.right):
+            the_codes[node.char] = newValue
+
+        return the_codes
diff --git a/huffman_py/functions/decode.py b/huffman_py/functions/decode.py
new file mode 100644
index 0000000..15eb82f
--- /dev/null
+++ b/huffman_py/functions/decode.py
@@ -0,0 +1,81 @@
+#
+#     Sam Hadow - Huffman-py
+#     Copyright (C) 2023
+#
+#     This program is free software: you can redistribute it and/or modify
+#     it under the terms of the GNU General Public License as published by
+#     the Free Software Foundation, either version 3 of the License, or
+#     (at your option) any later version.
+#
+#     This program is distributed in the hope that it will be useful,
+#     but WITHOUT ANY WARRANTY; without even the implied warranty of
+#     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+#     GNU General Public License for more details.
+#
+#     You should have received a copy of the GNU General Public License
+#     along with this program.  If not, see <http://www.gnu.org/licenses/>.
+#
+import re
+
+def huffman_decode(encodedData, current_node):
+        root = current_node
+        decodedOutput = []
+
+        # if single node in source tree (unique char in the text)
+        if (not root.left and not root.right):
+            string = ''.join([root.char for _ in encodedData])
+            return string
+
+        # else
+        for x in encodedData:
+            if x == '1':
+                current_node = current_node.right
+            elif x == '0':
+                current_node = current_node.left
+
+            # If internal node we keep going down, else (a leaf) we can decode a part of the binary.
+            try:
+                # internal node
+                if current_node.left.char == None and current_node.right.char == None:
+                    pass
+            except AttributeError:
+                # leaf
+                decodedOutput.append(current_node.char)
+                current_node = root
+
+        if current_node != root and (current_node.right !=None or current_node.left  != None):
+            # If we end on an internal node then source tree wasn't the correct tree.
+            raise ValueError ("Tree and binary don't correspond.")
+
+        string = ''.join([str(item) for item in decodedOutput])
+        return string
+
+def decode_from_dict(encodedData, dict_):
+    # we have a Dict like this: {char:code}
+    # we convert it to a Dict like that: {code:char} (both codes and chars are unique)
+    dict_ = {value:key for key,value in dict_.items()}
+    text = str(encodedData)
+
+    # we check if we have a binary
+    invalid_char  =  re.compile('[^01]')
+    if invalid_char.search(text):
+        raise TypeError ('Input text must be a binary.')
+
+    decoded = ''
+    sorted_dict = dict(sorted(dict_.items(), key=lambda x: len(x[0]), reverse=False))
+    while len(text) > 0:
+        for i,binary in enumerate(sorted_dict.keys()):
+            if binary == text[0:len(binary)]:
+                # If we have this binary part in our Dict we can decode a char
+                decoded += sorted_dict[binary]
+                # delete decoded part
+                text = text[len(binary):]
+                # next while iteration
+                break
+
+            # if nothing corresponds then it's not the correct Dict
+            elif i == len(sorted_dict.keys())-1:
+                raise ValueError ("Can't convert text with current Dict.")
+    return decoded
+
+
diff --git a/huffman_py/functions/encode.py b/huffman_py/functions/encode.py
new file mode 100644
index 0000000..d4b2047
--- /dev/null
+++ b/huffman_py/functions/encode.py
@@ -0,0 +1,62 @@
+#
+#     Sam Hadow - Huffman-py
+#     Copyright (C) 2023
+#
+#     This program is free software: you can redistribute it and/or modify
+#     it under the terms of the GNU General Public License as published by
+#     the Free Software Foundation, either version 3 of the License, or
+#     (at your option) any later version.
+#
+#     This program is distributed in the hope that it will be useful,
+#     but WITHOUT ANY WARRANTY; without even the implied warranty of
+#     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+#     GNU General Public License for more details.
+#
+#     You should have received a copy of the GNU General Public License
+#     along with this program.  If not, see <http://www.gnu.org/licenses/>.
+#
+from huffman_py.functions.occurence import *
+from huffman_py.functions.calculate_code import *
+from huffman_py.functions.print_binary import *
+from huffman_py.Node import Node
+from huffman_py.Tree import Tree
+
+def huffman_encode(the_data):
+        char_and_occurences = calcul_occurence(the_data)
+
+        # log char and occurences
+        the_char = char_and_occurences.keys()
+        the_occurences = char_and_occurences.values()
+        print("char: ", the_char)
+        print("occurences: ", the_occurences)
+
+        the_nodes = []
+
+        # convert char and occurences in nodes
+        for char in the_char:
+            the_nodes.append(Node(char_and_occurences.get(char), char))
+
+        while len(the_nodes) > 1:
+            # sort nodes
+            the_nodes = sorted(the_nodes, key = lambda x: x.occurrence)
+
+            # get the 2 smallest nodes
+            left = the_nodes[0]
+            right = the_nodes[1]
+
+            left.code = 0
+            right.code = 1
+
+            # Merge these 2 nodes
+            new_node = Node(left.occurrence + right.occurrence, left.char + right.char, left, right)
+
+            the_nodes.remove(left)
+            the_nodes.remove(right)
+            the_nodes.append(new_node)
+
+        my_tree = Tree(the_nodes[0])
+
+        huffmanEncoding = calculate_code(the_nodes[0])
+        print("char avec codes", huffmanEncoding)
+        encodedOutput = print_binary(the_data,huffmanEncoding)
+        return encodedOutput, the_nodes[0], huffmanEncoding
diff --git a/huffman_py/functions/ifFileGetContent.py b/huffman_py/functions/ifFileGetContent.py
new file mode 100644
index 0000000..c7b87d8
--- /dev/null
+++ b/huffman_py/functions/ifFileGetContent.py
@@ -0,0 +1,27 @@
+#
+#     Sam Hadow - Huffman-py
+#     Copyright (C) 2023
+#
+#     This program is free software: you can redistribute it and/or modify
+#     it under the terms of the GNU General Public License as published by
+#     the Free Software Foundation, either version 3 of the License, or
+#     (at your option) any later version.
+#
+#     This program is distributed in the hope that it will be useful,
+#     but WITHOUT ANY WARRANTY; without even the implied warranty of
+#     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+#     GNU General Public License for more details.
+#
+#     You should have received a copy of the GNU General Public License
+#     along with this program.  If not, see <http://www.gnu.org/licenses/>.
+#
+import os
+
+def ifFileGetContent(string):
+    '''input: str, return file content if str is a path, else str itself'''
+    if os.path.isfile(string):
+        with open(string, 'r') as fd:
+            content = fd.read()
+        return content
+    else:
+        return string
diff --git a/huffman_py/functions/occurence.py b/huffman_py/functions/occurence.py
new file mode 100644
index 0000000..3e76454
--- /dev/null
+++ b/huffman_py/functions/occurence.py
@@ -0,0 +1,25 @@
+#
+#     Sam Hadow - Huffman-py
+#     Copyright (C) 2023
+#
+#     This program is free software: you can redistribute it and/or modify
+#     it under the terms of the GNU General Public License as published by
+#     the Free Software Foundation, either version 3 of the License, or
+#     (at your option) any later version.
+#
+#     This program is distributed in the hope that it will be useful,
+#     but WITHOUT ANY WARRANTY; without even the implied warranty of
+#     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+#     GNU General Public License for more details.
+#
+#     You should have received a copy of the GNU General Public License
+#     along with this program.  If not, see <http://www.gnu.org/licenses/>.
+#
+def calcul_occurence(the_data):
+        the_char = dict()
+        for item in the_data:
+            if the_char.get(item) == None:
+                the_char[item] = 1
+            else:
+                the_char[item] += 1
+        return the_char