diff --git a/.DS_Store b/.DS_Store
new file mode 100644
index 0000000..c38df0d
Binary files /dev/null and b/.DS_Store differ
diff --git a/problem1.py b/problem1.py
new file mode 100644
index 0000000..aed718a
--- /dev/null
+++ b/problem1.py
@@ -0,0 +1,8 @@
+import pandas as pd  
+    
+lst = [['FirstName1', 'LastName1'], 
+    ['FirstName2', 'LastName2'], 
+
+
+df = pd.DataFrame(lst, columns =['First_Name', 'Last_Name']) 
+print(df )
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diff --git a/problem2.py b/problem2.py
new file mode 100644
index 0000000..4fd4c7f
--- /dev/null
+++ b/problem2.py
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+import pandas as pd
+
+def big_countries(world: pd.DataFrame) -> pd.DataFrame:
+
+    condition = world[(world['area'] >= 3000000) | (world['population'] >= 25000000)]
+    df = condition[['name','population','area']]
+
+    return df
+
diff --git a/problem3.py b/problem3.py
new file mode 100644
index 0000000..286e6dc
--- /dev/null
+++ b/problem3.py
@@ -0,0 +1,9 @@
+import pandas as pd
+
+def find_products(products: pd.DataFrame) -> pd.DataFrame:
+    '''Simple pandas & condition'''
+    condition = products[(products['low_fats'] == 'Y') & (products['recyclable'] == 'Y')]
+
+    product_ids = condition[['product_id']]
+
+    return product_ids
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diff --git a/problem4.py b/problem4.py
new file mode 100644
index 0000000..49cdfb0
--- /dev/null
+++ b/problem4.py
@@ -0,0 +1,5 @@
+import pandas as pd
+
+def find_customers(customers: pd.DataFrame, orders: pd.DataFrame) -> pd.DataFrame:
+    condition = customers[~customers['id'].isin(orders['customerId'])]
+    return condition[['name']].rename(columns={'name': 'Customers'})