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extra lab done #128

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163 changes: 141 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 @@ -71,7 +71,18 @@
"metadata": {},
"outputs": [],
"source": [
"transactions = [(-1200, 'debit'), (2500, 'credit'), (-100, 'debit'), (850, 'credit'), (-250, 'debit'), (1500, 'credit'), (-300, 'debit'), (5000, 'credit'), (-850, 'debit'), (1000, 'credit')]"
"transactions = [\n",
" (-1200, \"debit\"),\n",
" (2500, \"credit\"),\n",
" (-100, \"debit\"),\n",
" (850, \"credit\"),\n",
" (-250, \"debit\"),\n",
" (1500, \"credit\"),\n",
" (-300, \"debit\"),\n",
" (5000, \"credit\"),\n",
" (-850, \"debit\"),\n",
" (1000, \"credit\"),\n",
"]"
]
},
{
Expand All @@ -97,9 +108,25 @@
"execution_count": null,
"id": "0781335d-39cf-403d-b86a-ca908a09fe55",
"metadata": {},
"outputs": [],
"outputs": [
{
"name": "stdout",
"output_type": "stream",
"text": [
"[(-1200, 'debit'), (-100, 'debit'), (-250, 'debit'), (-300, 'debit'), (-850, 'debit')]\n"
]
}
],
"source": [
"# your code goes here"
"from numpy import negative\n",
"\n",
"\n",
"debit_transaction = list(filter(lambda key: key[0] < 0, transactions))\n",
"\n",
"# OR\n",
"\n",
"debit_transaction1 = list(filter(lambda key: key[1] == \"debit\", transactions))\n",
"print(debit_transaction)"
]
},
{
Expand Down Expand Up @@ -127,9 +154,43 @@
"execution_count": null,
"id": "25073469-7258-4fc6-b0a0-ef8ea57688fe",
"metadata": {},
"outputs": [],
"outputs": [
{
"data": {
"text/plain": [
"[(-1200, 'debit'),\n",
" (-850, 'debit'),\n",
" (-300, 'debit'),\n",
" (-250, 'debit'),\n",
" (-100, 'debit')]"
]
},
"execution_count": 47,
"metadata": {},
"output_type": "execute_result"
}
],
"source": [
"# your code goes here"
"import functools\n",
"\n",
"# 2. Define the lambda function sort_descending (as requested)\n",
"# It returns True (1) if the first amount is greater than the second\n",
"sorted_descending = lambda t1, t2: t1[0] > t2[0]\n",
"\n",
"\n",
"# 3. Use sorted() with a helper to convert the boolean logic into a sorting key\n",
"# We use cmp_to_key because Python 3 sorted() expects a comparison key\n",
"def compare(t1, t2):\n",
" if sorted_descending(t1, t2):\n",
" return -1 # t1 is greater, so it comes \"first\" for descending order\n",
" return 1\n",
"\n",
"\n",
"sorted_debits = sorted(debit_transaction1, key=functools.cmp_to_key(compare))\n",
"\n",
"# BEST WAY\n",
"sorted_deb = sorted(debit_transaction1, key=lambda x: x[0], reverse=False)\n",
"sorted_deb"
]
},
{
Expand Down Expand Up @@ -158,7 +219,7 @@
},
{
"cell_type": "code",
"execution_count": null,
"execution_count": 29,
"id": "e1de9d03-f029-4e2e-9733-ae92e3de7527",
"metadata": {},
"outputs": [],
Expand All @@ -172,9 +233,22 @@
"execution_count": null,
"id": "2f253b7e-5300-4819-b38f-9fc090554f51",
"metadata": {},
"outputs": [],
"outputs": [
{
"data": {
"text/plain": [
"[105.0, 52.5, -26.25, 1050.0, -10.5]"
]
},
"execution_count": 36,
"metadata": {},
"output_type": "execute_result"
}
],
"source": [
"# your code goes here"
"interest = 0.05\n",
"new_balance = list(map(lambda b: b * (1 + interest), balances))\n",
"new_balance"
]
},
{
Expand All @@ -201,9 +275,9 @@
"outputs": [],
"source": [
"accounts = [\n",
" {'balance': 1000, 'interest_rate': 0.02},\n",
" {'balance': 2000, 'interest_rate': 0.01},\n",
" {'balance': 500, 'interest_rate': 0.03},\n",
" {\"balance\": 1000, \"interest_rate\": 0.02},\n",
" {\"balance\": 2000, \"interest_rate\": 0.01},\n",
" {\"balance\": 500, \"interest_rate\": 0.03},\n",
"]"
]
},
Expand All @@ -212,9 +286,24 @@
"execution_count": null,
"id": "0906a9b0-d567-4786-96f2-5755611b885e",
"metadata": {},
"outputs": [],
"outputs": [
{
"data": {
"text/plain": [
"[{'balance': 1020.0}, {'balance': 2020.0}, {'balance': 515.0}]"
]
},
"execution_count": 44,
"metadata": {},
"output_type": "execute_result"
}
],
"source": [
"# your code goes here\n"
"# your code goes here\n",
"new_balance = list(\n",
" map(lambda acc: {\"balance\": acc[\"balance\"] * (1 + acc[\"interest_rate\"])}, accounts)\n",
")\n",
"new_balance"
]
},
{
Expand Down Expand Up @@ -246,11 +335,25 @@
"execution_count": null,
"id": "6284dbd3-e117-411e-8087-352be6deaed4",
"metadata": {},
"outputs": [],
"outputs": [
{
"data": {
"text/plain": [
"-2700"
]
},
"execution_count": 57,
"metadata": {},
"output_type": "execute_result"
}
],
"source": [
"from functools import reduce\n",
"\n",
"# your code goes here"
"total = reduce(lambda a, b: a + b[0], sorted_deb, 0)\n",
"total\n",
"\n",
"# something else"
]
},
{
Expand All @@ -276,21 +379,37 @@
"execution_count": null,
"id": "da2264b5-298e-4b45-99df-852b94e90d15",
"metadata": {},
"outputs": [],
"outputs": [
{
"data": {
"text/plain": [
"[650, 1600, 275]"
]
},
"execution_count": 59,
"metadata": {},
"output_type": "execute_result"
}
],
"source": [
"accounts = [\n",
" {'balance': 1000, 'withdrawals': [100, 50, 200]},\n",
" {'balance': 2000, 'withdrawals': [300, 100]},\n",
" {'balance': 500, 'withdrawals': [50, 100, 75]},\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"
"\n",
"def calculate_balance(balance_dict):\n",
" return balance_dict[\"balance\"] - sum(balance_dict[\"withdrawals\"])\n",
"\n",
"\n",
"list(map(calculate_balance, accounts))"
]
}
],
"metadata": {
"kernelspec": {
"display_name": "Python 3 (ipykernel)",
"display_name": "base",
"language": "python",
"name": "python3"
},
Expand All @@ -304,7 +423,7 @@
"name": "python",
"nbconvert_exporter": "python",
"pygments_lexer": "ipython3",
"version": "3.9.13"
"version": "3.13.9"
}
},
"nbformat": 4,
Expand Down