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[FT-072025] Eppu Henriksson #108

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146 changes: 121 additions & 25 deletions lab-python-lambda-map-reduce-filter.ipynb
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Original file line number Diff line number Diff line change
Expand Up @@ -66,7 +66,7 @@
},
{
"cell_type": "code",
"execution_count": null,
"execution_count": 2,
"id": "08463071-9351-4d49-8d29-4fcb817fb177",
"metadata": {},
"outputs": [],
Expand All @@ -87,19 +87,36 @@
"id": "16796011-a618-499a-a57f-4ca61d0a77e7",
"metadata": {},
"source": [
"Create a new list called credits that includes all of the debit transactions from the list transactions.\n",
"Create a new list called debits that includes all of the debit transactions from the list transactions.\n",
"\n",
"Use the filter() function to create a new list called debits."
]
},
{
"cell_type": "code",
"execution_count": null,
"execution_count": 3,
"id": "0781335d-39cf-403d-b86a-ca908a09fe55",
"metadata": {},
"outputs": [],
"outputs": [
{
"data": {
"text/plain": [
"[(-1200, 'debit'),\n",
" (-100, 'debit'),\n",
" (-250, 'debit'),\n",
" (-300, 'debit'),\n",
" (-850, 'debit')]"
]
},
"execution_count": 3,
"metadata": {},
"output_type": "execute_result"
}
],
"source": [
"# your code goes here"
"# your code goes here\n",
"debits = list(filter(lambda x: x[1] == 'debit', transactions))\n",
"debits"
]
},
{
Expand All @@ -124,12 +141,30 @@
},
{
"cell_type": "code",
"execution_count": null,
"execution_count": 5,
"id": "25073469-7258-4fc6-b0a0-ef8ea57688fe",
"metadata": {},
"outputs": [],
"outputs": [
{
"data": {
"text/plain": [
"[(-1200, 'debit'),\n",
" (-100, 'debit'),\n",
" (-250, 'debit'),\n",
" (-300, 'debit'),\n",
" (-850, 'debit')]"
]
},
"execution_count": 5,
"metadata": {},
"output_type": "execute_result"
}
],
"source": [
"# your code goes here"
"# your code goes here\n",
"extract = lambda x: x[1]\n",
"sorted_debits = sorted(debits, key=extract, reverse=True)\n",
"sorted_debits"
]
},
{
Expand Down Expand Up @@ -158,7 +193,7 @@
},
{
"cell_type": "code",
"execution_count": null,
"execution_count": 8,
"id": "e1de9d03-f029-4e2e-9733-ae92e3de7527",
"metadata": {},
"outputs": [],
Expand All @@ -169,12 +204,25 @@
},
{
"cell_type": "code",
"execution_count": null,
"execution_count": 9,
"id": "2f253b7e-5300-4819-b38f-9fc090554f51",
"metadata": {},
"outputs": [],
"outputs": [
{
"data": {
"text/plain": [
"[105.0, 52.5, -26.25, 1050.0, -10.5]"
]
},
"execution_count": 9,
"metadata": {},
"output_type": "execute_result"
}
],
"source": [
"# your code goes here"
"# your code goes here\n",
"with_interest = list(map(lambda x: x*1.05, balances))\n",
"with_interest"
]
},
{
Expand All @@ -195,7 +243,7 @@
},
{
"cell_type": "code",
"execution_count": null,
"execution_count": 12,
"id": "69e24c3b-385e-44d6-a8ed-705a3f58e696",
"metadata": {},
"outputs": [],
Expand All @@ -209,12 +257,30 @@
},
{
"cell_type": "code",
"execution_count": null,
"execution_count": 13,
"id": "0906a9b0-d567-4786-96f2-5755611b885e",
"metadata": {},
"outputs": [],
"outputs": [
{
"name": "stdout",
"output_type": "stream",
"text": [
"[{'balance_after_1_year': 1020.0}, {'balance_after_1_year': 2020.0}, {'balance_after_1_year': 515.0}]\n"
]
}
],
"source": [
"# your code goes here\n"
"# Function to compute new balance after 1 year\n",
"def apply_interest(account):\n",
" new_balance = account[\"balance\"] * (1 + account[\"interest_rate\"])\n",
" return {\n",
" \"balance_after_1_year\": round(new_balance, 2)\n",
" }\n",
"# Use map to apply the function to all accounts\n",
"updated_accounts = list(map(apply_interest, accounts))\n",
"\n",
"# Output\n",
"print(updated_accounts)"
]
},
{
Expand Down Expand Up @@ -243,14 +309,26 @@
},
{
"cell_type": "code",
"execution_count": null,
"execution_count": 17,
"id": "6284dbd3-e117-411e-8087-352be6deaed4",
"metadata": {},
"outputs": [],
"outputs": [
{
"data": {
"text/plain": [
"-36.75"
]
},
"execution_count": 17,
"metadata": {},
"output_type": "execute_result"
}
],
"source": [
"from functools import reduce\n",
"\n",
"# your code goes here"
"neg_list = list(filter(lambda x: x < 0, with_interest))\n",
"reduce(lambda x,y: x+y, neg_list)"
]
},
{
Expand All @@ -273,26 +351,44 @@
},
{
"cell_type": "code",
"execution_count": null,
"execution_count": 18,
"id": "da2264b5-298e-4b45-99df-852b94e90d15",
"metadata": {},
"outputs": [],
"outputs": [
{
"name": "stdout",
"output_type": "stream",
"text": [
"[650, 1600, 275]\n"
]
}
],
"source": [
"accounts = [\n",
" {'balance': 1000, 'withdrawals': [100, 50, 200]},\n",
" {'balance': 2000, 'withdrawals': [300, 100]},\n",
" {'balance': 500, 'withdrawals': [50, 100, 75]},\n",
"]\n",
"\n",
"# your code goes here\n"
"# Define the function to calculate remaining balance\n",
"def calculate_balance(account):\n",
" total_withdrawals = sum(account['withdrawals'])\n",
" remaining_balance = account['balance'] - total_withdrawals\n",
" return remaining_balance\n",
"\n",
"# Use map to apply the function to the list of accounts\n",
"remaining_balances = list(map(calculate_balance, accounts))\n",
"\n",
"# Output the result\n",
"print(remaining_balances)"
]
}
],
"metadata": {
"kernelspec": {
"display_name": "Python 3 (ipykernel)",
"display_name": "Python [conda env:base] *",
"language": "python",
"name": "python3"
"name": "conda-base-py"
},
"language_info": {
"codemirror_mode": {
Expand All @@ -304,7 +400,7 @@
"name": "python",
"nbconvert_exporter": "python",
"pygments_lexer": "ipython3",
"version": "3.9.13"
"version": "3.13.5"
}
},
"nbformat": 4,
Expand Down