diff --git a/requirements.txt b/requirements.txt
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+++ b/requirements.txt
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+datetime
+tweepy
+emoji
\ No newline at end of file
diff --git a/tweet_pourcent.py b/tweet_pourcent.py
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+++ b/tweet_pourcent.py
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+"""
+    Calculate the percentage we are in the year, and tweet it.
+"""
+from datetime import datetime, date
+import tweepy
+import emoji
+
+PROGRESS_BAR_SIZE = 25
+
+#Your Twitter API credentials
+CONSUMER_KEY = '<consumer key>'
+CONSUMER_SECRET = '<consumer secret>'
+ACCESS_TOKEN = '<access token>'
+ACCESS_TOKEN_SECRET = '<access token secret>'
+
+
+def progress_bar(percentage: int, size: int):
+    """
+        Build and returns a progress bar.
+    """
+    proggress = " | "
+    for i in range(size):
+        if percentage * size / 100 >= i:
+            proggress += "#"
+        else:
+            proggress += "-"
+    proggress += " | "
+    return proggress
+
+
+def percentage_year():
+    """
+        Calculate and returns the current year percentage.
+    """
+    current_year = datetime.now().year
+    start = date(current_year, 1, 1).toordinal()
+    next_year = date(current_year + 1, 1, 1).toordinal()
+    days_in_current_year = next_year - start
+    now = date.today().toordinal()
+    current_day_in_year = now - start
+    return (current_day_in_year * 100) / days_in_current_year
+
+def tweet_it(text: str):
+    """
+        Tweet a given text.
+    """
+    auth = tweepy.OAuthHandler(CONSUMER_KEY, CONSUMER_SECRET)
+    auth.set_access_token(ACCESS_TOKEN, ACCESS_TOKEN_SECRET)
+    api = tweepy.API(auth)
+    api.update_status(text)
+
+def launch():
+    """
+        Starts the program. The beginning.
+    """
+    text_to_tweet = "Bonjour Twitter ! :hatching_chick: "
+    text_to_tweet += "Nous sommes le  " + datetime.today().strftime('%d-%m-%Y') + " ! "
+    text_to_tweet += "Nous sommes actuellement à " + progress_bar(
+        int(percentage_year()), PROGRESS_BAR_SIZE) + str(
+            int(percentage_year())) + "% de cette année "
+    text_to_tweet += str(datetime.now().year) + " ! :fire: "
+    text_to_tweet += "Bonne journée !"
+    tweet_it(emoji.emojize(text_to_tweet))
+
+
+if __name__ == "__main__":
+    launch()