Refactor code in numerical methods notebooks

- Updated import order in Point_Fixe.ipynb for consistency.
- Changed lambda functions to regular function definitions for clarity in Point_Fixe.ipynb.
- Added numpy import in TP1_EDO_EulerExp.ipynb, TP2_Lokta_Volterra.ipynb, and TP3_Convergence.ipynb for better readability.
- Modified for loops in TP1_EDO_EulerExp.ipynb and TP2_Lokta_Volterra.ipynb to include strict=False for compatibility with future Python versions.

M1/Portfolio Management/TP-Project.ipynb

@@ -27,9 +27,9 @@
    },
    "outputs": [],
    "source": [
-    "import yfinance as yf\n",
+    "import numpy as np\n",
     "import pandas as pd\n",
-    "import numpy as np"
+    "import yfinance as yf"
    ]
   },
   {

M1/Portfolio Management/TP1.ipynb

@@ -13,9 +13,9 @@
    },
    "outputs": [],
    "source": [
-    "import yfinance as yf\n",
+    "import numpy as np\n",
     "import pandas as pd\n",
-    "import numpy as np"
+    "import yfinance as yf"
    ]
   },
   {