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159 changes: 137 additions & 22 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": 35,
"id": "08463071-9351-4d49-8d29-4fcb817fb177",
"metadata": {},
"outputs": [],
Expand Down Expand Up @@ -94,12 +94,25 @@
},
{
"cell_type": "code",
"execution_count": null,
"execution_count": 38,
"id": "0781335d-39cf-403d-b86a-ca908a09fe55",
"metadata": {},
"outputs": [],
"outputs": [
{
"name": "stdout",
"output_type": "stream",
"text": [
"Credits: [(2500, 'credit'), (850, 'credit'), (1500, 'credit'), (5000, 'credit'), (1000, 'credit')]\n",
"Debits: [(-1200, 'debit'), (-100, 'debit'), (-250, 'debit'), (-300, 'debit'), (-850, 'debit')]\n"
]
}
],
"source": [
"# your code goes here"
"# your code goes here\n",
"credits = list(filter(lambda transaction: transaction[1] == 'credit', transactions))\n",
"debits = list(filter(lambda transaction: transaction[1] == 'debit', transactions))\n",
"print(\"Credits:\", credits)\n",
"print(\"Debits:\", debits)"
]
},
{
Expand All @@ -124,12 +137,23 @@
},
{
"cell_type": "code",
"execution_count": null,
"execution_count": 41,
"id": "25073469-7258-4fc6-b0a0-ef8ea57688fe",
"metadata": {},
"outputs": [],
"outputs": [
{
"name": "stdout",
"output_type": "stream",
"text": [
"Debits sorted in descending order: [(-100, 'debit'), (-250, 'debit'), (-300, 'debit'), (-850, 'debit'), (-1200, 'debit')]\n"
]
}
],
"source": [
"# your code goes here"
"# your code goes here\n",
"sort_descending = lambda transaction: transaction[0]\n",
"debits_sorted_desc = sorted(debits, key=sort_descending, reverse=True)\n",
"print(\"Debits sorted in descending order:\", debits_sorted_desc)"
]
},
{
Expand Down Expand Up @@ -158,7 +182,7 @@
},
{
"cell_type": "code",
"execution_count": null,
"execution_count": 45,
"id": "e1de9d03-f029-4e2e-9733-ae92e3de7527",
"metadata": {},
"outputs": [],
Expand All @@ -169,12 +193,24 @@
},
{
"cell_type": "code",
"execution_count": null,
"execution_count": 46,
"id": "2f253b7e-5300-4819-b38f-9fc090554f51",
"metadata": {},
"outputs": [],
"outputs": [
{
"name": "stdout",
"output_type": "stream",
"text": [
"[105.0, 52.5, -25, 1050.0, -10]\n"
]
}
],
"source": [
"# your code goes here"
"# your code goes here\n",
"\n",
"add_interest = lambda balance: balance + (balance * 0.05) if balance > 0 else balance\n",
"new_balances = list(map(add_interest, balances))\n",
"print(new_balances) "
]
},
{
Expand All @@ -195,7 +231,7 @@
},
{
"cell_type": "code",
"execution_count": null,
"execution_count": 49,
"id": "69e24c3b-385e-44d6-a8ed-705a3f58e696",
"metadata": {},
"outputs": [],
Expand All @@ -209,12 +245,34 @@
},
{
"cell_type": "code",
"execution_count": null,
"execution_count": 50,
"id": "0906a9b0-d567-4786-96f2-5755611b885e",
"metadata": {},
"outputs": [],
"outputs": [
{
"name": "stdout",
"output_type": "stream",
"text": [
"{'balance': 1020.0, 'interest_rate': 0.02}\n",
"{'balance': 2020.0, 'interest_rate': 0.01}\n",
"{'balance': 515.0, 'interest_rate': 0.03}\n"
]
}
],
"source": [
"# your code goes here\n"
"# your code goes here\n",
"\n",
"add_interest = lambda account: {\n",
" \"balance\": account[\"balance\"] + (account[\"balance\"] * account[\"interest_rate\"]) if account[\"balance\"] > 0 else account[\"balance\"],\n",
" \"interest_rate\": account[\"interest_rate\"]\n",
"}\n",
"\n",
"\n",
"new_accounts = list(map(add_interest, accounts))\n",
"\n",
"\n",
"for account in new_accounts:\n",
" print(account)"
]
},
{
Expand Down Expand Up @@ -243,14 +301,33 @@
},
{
"cell_type": "code",
"execution_count": null,
"execution_count": 54,
"id": "6284dbd3-e117-411e-8087-352be6deaed4",
"metadata": {},
"outputs": [],
"outputs": [
{
"name": "stdout",
"output_type": "stream",
"text": [
"Total negative balances: -35\n"
]
}
],
"source": [
"from functools import reduce\n",
"\n",
"# your code goes here"
"# your code goes here\n",
"# Assume this is the result after applying 5% interest rate (e.g., Challenge 1, Exercise 1)\n",
"balances_after_interest = [105.0, 52.5, -25, 1050.0, -10]\n",
"\n",
"# Use filter() to get all negative balances\n",
"negative_balances = list(filter(lambda balance: balance < 0, balances_after_interest))\n",
"\n",
"# Use reduce() to sum up all the negative balances\n",
"total_negative_balance = reduce(lambda x, y: x + y, negative_balances)\n",
"\n",
"# Print the total negative balance\n",
"print(\"Total negative balances:\", total_negative_balance)"
]
},
{
Expand All @@ -273,19 +350,57 @@
},
{
"cell_type": "code",
"execution_count": null,
"execution_count": 57,
"id": "da2264b5-298e-4b45-99df-852b94e90d15",
"metadata": {},
"outputs": [],
"outputs": [
{
"name": "stdout",
"output_type": "stream",
"text": [
"Remaining balances after withdrawals: [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"
"# your code goes here\n",
"# Define the calculate_balance function\n",
"def calculate_balance(account):\n",
" \"\"\"\n",
" Calculate the remaining balance after subtracting all withdrawals.\n",
"\n",
" Parameters:\n",
" account (dict): A dictionary representing a bank account with keys 'balance' and 'withdrawals'.\n",
"\n",
" Returns:\n",
" float: The remaining balance after withdrawals.\n",
" \"\"\"\n",
" # Sum up all withdrawals and subtract from balance\n",
" total_withdrawals = sum(account.get('withdrawals', []))\n",
" remaining_balance = account['balance'] - total_withdrawals\n",
" return remaining_balance\n",
"\n",
"\n",
"# Use map to apply calculate_balance to each account\n",
"remaining_balances = list(map(calculate_balance, accounts))\n",
"\n",
"# Print the list of remaining balances\n",
"print(\"Remaining balances after withdrawals:\", remaining_balances)"
]
},
{
"cell_type": "code",
"execution_count": null,
"id": "159bd98c-19de-44b8-bc9e-213a17574947",
"metadata": {},
"outputs": [],
"source": []
}
],
"metadata": {
Expand All @@ -304,7 +419,7 @@
"name": "python",
"nbconvert_exporter": "python",
"pygments_lexer": "ipython3",
"version": "3.9.13"
"version": "3.12.4"
}
},
"nbformat": 4,
Expand Down