⚡️ Speed up method coinspot.fetch_balance by 8%

[codeflash-ai]

📄 8% (0.08x) speedup for coinspot.fetch_balance in python/ccxt/coinspot.py

⏱️ Runtime : 11.5 milliseconds → 10.6 milliseconds (best of 5 runs)

📝 Explanation and details

The optimization achieves an 8% speedup by replacing the safe_string method's double dictionary lookup pattern with a more efficient try/except approach.

Key Optimization:
The original safe_string used Exchange.key_exists(dictionary, key) followed by dictionary[key] - performing two dictionary lookups for every successful key access. The optimized version uses a single try/except block that directly accesses dictionary[key], catching KeyError, TypeError, and IndexError exceptions to handle missing keys or invalid dictionary types.

Performance Impact:

• 40% faster safe_string execution (21.2ms → 12.7ms in profiler results)
• Per-hit time reduced from 1240ns to 740ns - significant since safe_string is called 17,088 times in the test workload
• The optimization is most effective for successful key lookups (the common case), where it eliminates one dictionary access entirely

Test Case Performance:
The optimization shows consistent improvements across test scenarios:

• Large-scale tests benefit most: 1000-currency tests show 5-11% improvements due to the high volume of safe_string calls
• Multiple currency scenarios: 2-6% faster for tests with several currencies
• Single currency tests: Minimal impact due to fewer safe_string invocations

This optimization is particularly valuable in cryptocurrency exchange libraries where safe_string is frequently called during balance parsing and data extraction operations, making it a high-impact micro-optimization for data-intensive workloads.

✅ Correctness verification report:

Test	Status
⚙️ Existing Unit Tests	🔘 None Found
🌀 Generated Regression Tests	✅ 69 Passed
⏪ Replay Tests	🔘 None Found
🔎 Concolic Coverage Tests	🔘 None Found
📊 Tests Coverage	100.0%

🌀 Generated Regression Tests and Runtime

import pytest
from ccxt.coinspot import coinspot

--- Unit Tests ---

@pytest.fixture
def cs():
# Create a fresh coinspot instance for each test
return coinspot()

-------------------- Basic Test Cases --------------------

#------------------------------------------------
import pytest
from ccxt.coinspot import coinspot

------------------- UNIT TESTS -------------------

Helper: monkeypatch coinspot.private_post_my_balances for each test

@pytest.fixture
def coinspot_instance():
return coinspot()

------------------- BASIC TEST CASES -------------------

def test_single_currency_balance_dict(coinspot_instance):
# Test with single currency, dict format
def mock_balances(params):
return {'balance': {'BTC': 2.5}}
coinspot_instance.private_post_my_balances = mock_balances
codeflash_output = coinspot_instance.fetch_balance(); balance = codeflash_output # 28.1μs -> 28.2μs (0.184% slower)

def test_single_currency_balance_list(coinspot_instance):
# Test with single currency, list format
def mock_balances(params):
return {'balances': [{'ETH': {'balance': 1.234}}]}
coinspot_instance.private_post_my_balances = mock_balances
codeflash_output = coinspot_instance.fetch_balance(); balance = codeflash_output # 26.4μs -> 26.8μs (1.45% slower)

def test_multiple_currencies_balance_dict(coinspot_instance):
# Multiple currencies, dict format
def mock_balances(params):
return {'balance': {'BTC': 0.1, 'ETH': 2.5, 'LTC': 0.0}}
coinspot_instance.private_post_my_balances = mock_balances
codeflash_output = coinspot_instance.fetch_balance(); balance = codeflash_output # 40.5μs -> 38.3μs (5.73% faster)

def test_multiple_currencies_balance_list(coinspot_instance):
# Multiple currencies, list format
def mock_balances(params):
return {'balances': [
{'BTC': {'balance': 0.01}},
{'ETH': {'balance': 0.02}},
{'LTC': {'balance': 0.03}}
]}
coinspot_instance.private_post_my_balances = mock_balances
codeflash_output = coinspot_instance.fetch_balance(); balance = codeflash_output # 40.4μs -> 39.3μs (2.78% faster)

def test_balance_with_info_key(coinspot_instance):
# Test that 'info' key is preserved
def mock_balances(params):
return {'balance': {'BTC': 1.5}, 'status': 'ok'}
coinspot_instance.private_post_my_balances = mock_balances
codeflash_output = coinspot_instance.fetch_balance(); balance = codeflash_output # 25.6μs -> 25.8μs (0.714% slower)

------------------- EDGE TEST CASES -------------------

def test_empty_balance_dict(coinspot_instance):
# Empty dict
def mock_balances(params):
return {'balance': {}}
coinspot_instance.private_post_my_balances = mock_balances
codeflash_output = coinspot_instance.fetch_balance(); balance = codeflash_output # 10.2μs -> 9.71μs (4.79% faster)

def test_empty_balance_list(coinspot_instance):
# Empty list
def mock_balances(params):
return {'balances': []}
coinspot_instance.private_post_my_balances = mock_balances
codeflash_output = coinspot_instance.fetch_balance(); balance = codeflash_output # 10.6μs -> 10.5μs (0.066% faster)

def test_zero_balances(coinspot_instance):
# All balances zero
def mock_balances(params):
return {'balance': {'BTC': 0, 'ETH': 0, 'LTC': 0}}
coinspot_instance.private_post_my_balances = mock_balances
codeflash_output = coinspot_instance.fetch_balance(); balance = codeflash_output # 37.1μs -> 35.7μs (3.92% faster)

def test_negative_balance(coinspot_instance):
# Negative balance (e.g., debt)
def mock_balances(params):
return {'balance': {'BTC': -0.5}}
coinspot_instance.private_post_my_balances = mock_balances
codeflash_output = coinspot_instance.fetch_balance(); balance = codeflash_output # 26.0μs -> 25.9μs (0.564% faster)

def test_nonexistent_currency_code(coinspot_instance):
# Currency code not in mapping
def mock_balances(params):
return {'balance': {'DOGE': 123.456}}
coinspot_instance.private_post_my_balances = mock_balances
codeflash_output = coinspot_instance.fetch_balance(); balance = codeflash_output # 26.4μs -> 27.3μs (3.27% slower)

def test_balance_with_string_numbers(coinspot_instance):
# Balances as strings
def mock_balances(params):
return {'balance': {'BTC': '1.234', 'ETH': '0.0'}}
coinspot_instance.private_post_my_balances = mock_balances
codeflash_output = coinspot_instance.fetch_balance(); balance = codeflash_output # 30.9μs -> 30.6μs (1.27% faster)

def test_balance_with_extra_fields(coinspot_instance):
# Balances with extra fields in dict
def mock_balances(params):
return {'balances': [{'BTC': {'balance': 2.5, 'audbalance': 100.0, 'rate': 40000}}]}
coinspot_instance.private_post_my_balances = mock_balances
codeflash_output = coinspot_instance.fetch_balance(); balance = codeflash_output # 25.9μs -> 26.6μs (2.36% slower)

def test_balance_with_missing_balance_key(coinspot_instance):
# Missing 'balance' key in currency dict
def mock_balances(params):
return {'balances': [{'BTC': {'audbalance': 100.0, 'rate': 40000}}]}
coinspot_instance.private_post_my_balances = mock_balances
codeflash_output = coinspot_instance.fetch_balance(); balance = codeflash_output # 23.9μs -> 25.0μs (4.47% slower)

def test_balance_with_none(coinspot_instance):
# Balance is None
def mock_balances(params):
return {'balance': {'BTC': None}}
coinspot_instance.private_post_my_balances = mock_balances
codeflash_output = coinspot_instance.fetch_balance(); balance = codeflash_output # 23.0μs -> 24.4μs (5.36% slower)

def test_balance_with_unusual_types(coinspot_instance):
# Balance is boolean or other type
def mock_balances(params):
return {'balance': {'BTC': True, 'ETH': False, 'LTC': [1,2,3]}}
coinspot_instance.private_post_my_balances = mock_balances
codeflash_output = coinspot_instance.fetch_balance(); balance = codeflash_output # 40.4μs -> 38.5μs (4.96% faster)

def test_balance_with_large_float(coinspot_instance):
# Very large float
def mock_balances(params):
return {'balance': {'BTC': 1e12}}
coinspot_instance.private_post_my_balances = mock_balances
codeflash_output = coinspot_instance.fetch_balance(); balance = codeflash_output # 25.0μs -> 25.8μs (3.26% slower)

def test_balance_with_small_float(coinspot_instance):
# Very small float
def mock_balances(params):
return {'balance': {'BTC': 1e-12}}
coinspot_instance.private_post_my_balances = mock_balances
codeflash_output = coinspot_instance.fetch_balance(); balance = codeflash_output # 27.9μs -> 27.7μs (0.559% faster)

def test_balance_with_mixed_numeric_types(coinspot_instance):
# Mix of int, float, string
def mock_balances(params):
return {'balance': {'BTC': 1, 'ETH': 2.5, 'LTC': '3.5'}}
coinspot_instance.private_post_my_balances = mock_balances
codeflash_output = coinspot_instance.fetch_balance(); balance = codeflash_output # 38.4μs -> 37.5μs (2.64% faster)

------------------- LARGE SCALE TEST CASES -------------------

def test_large_number_of_currencies_dict(coinspot_instance):
# Test with 1000 currencies in dict format
N = 1000
currencies = {f'C{i}': float(i) for i in range(N)}
def mock_balances(params):
return {'balance': currencies}
coinspot_instance.private_post_my_balances = mock_balances
codeflash_output = coinspot_instance.fetch_balance(); balance = codeflash_output # 4.57ms -> 4.33ms (5.67% faster)
for i in range(N):
code = f'C{i}'

def test_large_number_of_currencies_list(coinspot_instance):
# Test with 1000 currencies in list format
N = 1000
balances = [{f'C{i}': {'balance': float(i)}} for i in range(N)]
def mock_balances(params):
return {'balances': balances}
coinspot_instance.private_post_my_balances = mock_balances
codeflash_output = coinspot_instance.fetch_balance(); balance = codeflash_output # 4.91ms -> 4.43ms (10.9% faster)
for i in range(N):
code = f'C{i}'

def test_large_balances_values(coinspot_instance):
# Test with large balance values
N = 100
currencies = {f'C{i}': 1e10 * i for i in range(N)}
def mock_balances(params):
return {'balance': currencies}
coinspot_instance.private_post_my_balances = mock_balances
codeflash_output = coinspot_instance.fetch_balance(); balance = codeflash_output # 493μs -> 449μs (9.68% faster)
for i in range(N):
code = f'C{i}'

def test_large_balances_small_values(coinspot_instance):
# Test with very small balance values
N = 100
currencies = {f'C{i}': 1e-10 * i for i in range(N)}
def mock_balances(params):
return {'balance': currencies}
coinspot_instance.private_post_my_balances = mock_balances
codeflash_output = coinspot_instance.fetch_balance(); balance = codeflash_output # 533μs -> 480μs (11.0% faster)
for i in range(N):
code = f'C{i}'

def test_large_balances_mixed_types(coinspot_instance):
# Test with mixed types and large scale
N = 100
currencies = {f'C{i}': str(i) if i % 2 == 0 else float(i) for i in range(N)}
def mock_balances(params):
return {'balance': currencies}
coinspot_instance.private_post_my_balances = mock_balances
codeflash_output = coinspot_instance.fetch_balance(); balance = codeflash_output # 481μs -> 447μs (7.59% faster)
for i in range(N):
code = f'C{i}'

------------------- ERROR CASES -------------------

To edit these changes git checkout codeflash/optimize-coinspot.fetch_balance-mhw2dvkl and push.