Python package designed for security returns analysis.
Project description
pyfinance
pyfinance is a Python package built for investment management and analysis of security returns.
It is meant to be a complement to existing packages geared towards quantitative finance, such as pyfolio, pandas-datareader, and fecon235.
Supports | Python 3.5 | 3.6 | 3.7 | 3.8 | 3.9 |
Latest Release |
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Package Status |
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License |
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Contents
pyfinance is best explored on a module-by-module basis:
Module | Description |
---|---|
datasets.py |
Financial dataset download & assembly via requests . |
general.py |
General-purpose financial computations, such as active share calculation, returns distribution approximation, and tracking error optimization. |
ols.py |
Ordinary least-squares (OLS) regression, supporting static and rolling cases, built with a matrix formulation and implemented with NumPy. |
options.py |
Vectorized option calculations, including Black-Scholes Merton European option valuation, Greeks, and implied volatility, as well as payoff determination for common money-spread option strategies. |
returns.py |
Statistical analysis of financial time series through the CAPM framework, designed to mimic functionality of software such as FactSet Research Systems and Zephyr, with improved speed and flexibility. |
utils.py |
Utilities not fitting into any of the above. |
Please note that returns
and general
are still in development; they are not thoroughly tested and have some NotImplemented features.
Installation
pyfinance is available via PyPI. Install with pip:
$ python3 -m install pyfinance
Note: pyfinance aims for compatibility with all minor releases of Python 3.x, but does not guarantee workability with Python 2.x.
Dependencies
pyfinance relies primarily on Python's scientific stack, including NumPy, Pandas, Matplotlib, Seaborn, Scikit-Learn, and StatsModels. Other dependencies include Beautiful Soup, Requests, xrld, and xmltodict.
See setup.py
for specific version threshold requirements.
Tutorial
This is a walkthrough of some of pyfinance's features.
The returns.py
module is designed for statistical analysis of financial time series through the CAPM framework, designed to mimic functionality of software such as FactSet Research Systems and Zephyr, with improved speed and flexibility.
Its main class is TSeries
, a subclassed Pandas Series. The DataFrame equivalent, TFrame
, is not yet implemented as of March 2018.
TSeries
implements a collection of new methods that pertain specifically to investment management and the study of security returns and asset performance, such cumulative return indices and drawdown.
Here's an example of construction:
>>> import numpy as np >>> import pandas as pd >>> from pyfinance import TSeries >>> np.random.seed(444) # Normally distributed with 0.08% daily drift term. >>> s = np.random.randn(400) / 100 + 0.0008 >>> idx = pd.date_range(start='2016', periods=len(s)) # default daily freq. >>> ts = TSeries(s, index=idx) >>> ts.head() 2016-01-01 0.0044 2016-01-02 0.0046 2016-01-03 0.0146 2016-01-04 0.0126 2016-01-05 -0.0086 Freq: D, dtype: float64
And a few "new" methods:
>>> ts.max_drawdown() -0.12374551561531844 # Downsample to quarterly compounded returns. >>> ts.rollup('Q') 2016-03-31 0.0450 2016-06-30 0.1240 2016-09-30 0.0631 2016-12-31 -0.0081 2017-03-31 0.1925 Freq: Q-DEC, dtype: float64 >>> ts.anlzd_stdev() 0.16318780660107757 >>> ts.sharpe_ratio(ddof=1) 2.501797257311737
Some statistics are benchmark-relative. For methods that take a benchmark
parameter, benchmark
can be either another TSeries
, a Pandas Series, a 1d NumPy array.
>>> bmk = TSeries(np.random.randn(400) / 100 + .0005, ... index=ts.index) >>> ts.beta_adj(bmk) 0.3176455956603447 >>> ts.tracking_error(benchmark=bmk) 0.23506660057562254
With CAPM-related statistics such as alpha, beta, and R-squared, it can also be a Pandas DataFrame or 2d NumPy array.
>>> multi_bmk = pd.DataFrame(np.random.randn(400, 2) / 100 + .0005, ... index=ts.index) >>> # Multifactor model support. >>> ts.alpha(multi_bmk) 0.0010849614688207107
TSeries
comes with just one additional and optional argument that must be as a keyword argument: freq
(default None
) allows for manual specification of the time-series frequency. It may be any frequency string or anchored offset string recognized by Pandas, such as 'D', '5D', 'Q', 'Q-DEC', or 'BQS-APR'.
>>> # This is okay as long as a frequency can be inferred. >>> ts.freq is None True
The purpose of this extra parameter is to create an annualization factor for statistics that are given on an annualized basis, such as standard deviation.
If no frequency is passed explicitly, pyfinance will attempt to infer an annualization factor from the Index, with an exception being raised if neither of these yield a frequency.
>>> no_idx = TSeries(np.random.laplace(size=24) * .01 + .005, freq='M') >>> no_idx.freq 'M' >>> no_idx.anlzd_ret() 0.04975219957136123
freq
can also be passed within some methods, which will override the class instance's .freq
if it exists:
>>> no_idx.anlzd_ret(freq='W') # Treat `no_idx` as weekly returns. 0.2341731795205313
datasets.py
provides for financial dataset download & assembly via requests
. It leverages sources including:
- Ken French's data library (via
pandas-datareader
); - SEC.gov;
- cboe.com;
- AQR's dataset page;
- fred.stlouisfed.org;
- Robert Shiller's page at econ.yale.edu.
Below is a batch of examples.
Load SEC 13F filings:
# Third Point LLC June 2017 13F >>> from pyfinance import datasets >>> url = 'https://www.sec.gov/Archives/edgar/data/1040273/000108514617001787/form13fInfoTable.xml' # noqa >>> df = datasets.load_13f(url=url) >>> df.head() nameOfIssuer titleOfClass cusip value votingAuthority 0 ALEXION PHARMACE... COM 015351109 152088 1250000 1 ALIBABA GROUP HL... SPONSORED ADS 01609W102 634050 4500000 2 ALPHABET INC CAP STK CL A 02079K305 534566 575000 3 ANTHEM INC COM 036752103 235162 1250000 4 BANCO MACRO SA SPON ADR B 05961W105 82971 900000
Industry-portfolio monthly returns:
>>> from pyfinance import datasets >>> ind = datasets.load_industries() >>> ind.keys() dict_keys([5, 10, 12, 17, 30, 38, 48]) # Monthly returns to 5 industry portfolios >>> ind[5].head() Cnsmr Manuf HiTec Hlth Other Date 1950-01-31 1.26 1.47 3.21 1.06 3.19 1950-02-28 1.91 1.29 2.06 1.92 1.02 1950-03-31 0.28 1.93 3.46 -2.90 -0.68 1950-04-30 3.22 5.21 3.58 5.52 1.50 1950-05-31 3.81 6.18 1.07 3.96 1.36
S&P 500 and interest rate data from Robert Shiller's website, 1871-present:
>>> from pyfinance import datasets >>> shiller = datasets.load_shiller() >>> shiller.iloc[:7, :5] sp50p sp50d sp50e cpi real_rate date 1871-01-31 4.44 0.26 0.4 12.4641 5.3200 1871-02-28 4.50 0.26 0.4 12.8446 5.3233 1871-03-31 4.61 0.26 0.4 13.0350 5.3267 1871-04-30 4.74 0.26 0.4 12.5592 5.3300 1871-05-31 4.86 0.26 0.4 12.2738 5.3333 1871-06-30 4.82 0.26 0.4 12.0835 5.3367 1871-07-31 4.73 0.26 0.4 12.0835 5.3400
The ols.py
module provides ordinary least-squares (OLS) regression, supporting static and rolling cases, and is built with a matrix formulation and implemented with NumPy.
First, let's load some data on currencies, interest rates, and commodities to generate a regression of changes in the trade-weighted USD against interest rate term spreads and copper.
>>> from pandas_datareader import DataReader >>> syms = { ... 'TWEXBMTH': 'usd', ... 'T10Y2YM': 'term_spread', ... 'PCOPPUSDM': 'copper' ... } >>> data = DataReader(syms.keys(), data_source='fred', ... start='2000-01-01', end='2016-12-31')\ ... .pct_change()\ ... .dropna()\ ... .rename(columns=syms) >>> y = data.pop('usd') >>> data.head() term_spread copper DATE 2000-02-01 -1.4091 -0.0200 2000-03-01 2.0000 -0.0372 2000-04-01 0.5185 -0.0333 2000-05-01 -0.0976 0.0614 2000-06-01 0.0270 -0.0185 >>> y.head() DATE 2000-02-01 0.0126 2000-03-01 -0.0001 2000-04-01 0.0056 2000-05-01 0.0220 2000-06-01 -0.0101
The OLS
class implements "static" (single) linear regression, with the model being fit when the object is instantiated.
It is designed primarily for statistical inference, not out-of-sample prediction, and its attributes largely mimic the structure of StatsModels' RegressionResultsWrapper.
>>> from pyfinance import ols >>> model = ols.OLS(y=y, x=data) >>> model.alpha # the intercept - a scalar 0.0012303204434167458 >>> model.beta # the coefficients array([-0.0006, -0.0949]) >>> model.fstat 33.42923069295481 # Residuals and predicted y values are NumPy arrays # with the same shape as `y`. >>> model.resids.shape (203,) >>> model.predicted.shape (203,)
The module also supports rolling regression. (Iterative regressions done on sliding windows over the data.)
RollingOLS
has methods that generate NumPy arrays as outputs.PandasRollingOLS
is a wrapper aroundRollingOLS
and is meant to mimic the look of Pandas's deprecatedMovingOLS
class. It generates Pandas DataFrame and Series outputs.
Note: all solutions are generated through a matrix formulation, which takes advantage of NumPy's broadcasting capabilities to expand the classical matrix formulation to an additional dimension. This approach may be slow for significantly large datasets.
Also, note that windows are not "time-aware" in the way that Pandas time functionality is. Because of the NumPy implementation, specifying a window of 12 where the index contains one missing months would generate a regression over 13 months. To avoid this, simply reindex the input data to a set frequency.
# 12-month rolling regressions # First entry would be the "12 months ending" 2001-01-30 >>> rolling = ols.PandasRollingOLS(y=y, x=data, window=12) >>> rolling.beta.head() term_spread copper DATE 2001-01-01 9.9127e-05 0.0556 2001-02-01 4.7607e-04 0.0627 2001-03-01 1.4671e-03 0.0357 2001-04-01 1.6101e-03 0.0296 2001-05-01 1.5839e-03 -0.0449 >>> rolling.alpha.head() DATE 2001-01-01 0.0055 2001-02-01 0.0050 2001-03-01 0.0067 2001-04-01 0.0070 2001-05-01 0.0048 >>> rolling.pvalue_alpha.head() DATE 2001-01-01 0.0996 2001-02-01 0.1101 2001-03-01 0.0555 2001-04-01 0.0479 2001-05-01 0.1020
options.py
is built for vectorized options calculations.
BSM
encapsulates a European option and its associated value, Greeks, and implied volatility, using the Black-Scholes Merton model.
>>> from pyfinance.options import BSM >>> op = BSM(S0=100, K=100, T=1, r=.04, sigma=.2) >>> op.summary() OrderedDict([('Value', 9.925053717274437), ('d1', 0.3), ('d2', 0.09999999999999998), ('Delta', 0.6179114221889526), ('Gamma', 0.019069390773026208), ('Vega', 38.138781546052414), ('Theta', -5.888521694670074), ('Rho', 51.86608850162082), ('Omega', 6.225774084360724)]) # What is the implied annualized volatility at P=10? >>> op.implied_vol(value=10) 0.20196480875586834 # Vectorized - pass an array of strikes. >>> import numpy as np >>> ops = BSM(S0=100, K=np.arange(100, 110), T=1, r=.04, sigma=.2) >>> ops.value() array([9.9251, 9.4159, 8.9257, 8.4543, 8.0015, 7.567 , 7.1506, 6.7519, 6.3706, 6.0064]) # Multiple array inputs are evaluated elementwise/zipped. >>> ops2 = BSM(S0=np.arange(100, 110), K=np.arange(100, 110), ... T=1, r=.04, sigma=.2) >>> ops2 BSM(kind=call, S0=[100 101 102 103 104 105 106 107 108 109], K=[100 101 102 103 104 105 106 107 108 109], T=1, r=0.04, sigma=0.2) >>> ops2.value() array([ 9.9251, 10.0243, 10.1236, 10.2228, 10.3221, 10.4213, 10.5206, 10.6198, 10.7191, 10.8183])
options.py
also exports a handful of options strategies, such as Straddle
, Straddle
, Strangle
, BullSpread
, and ShortButterfly
, to name a few.
All of these inherit from a generic and customizable OpStrat
class, which can be built from an arbitrary number of puts and/or calls.
Here is an example of constructing a bear spread, which is a combination of 2 puts or 2 calls (put is the default). Here, we are short a put at 1950 and long a put at 2050. Like the case of a single option, the instance methods are vectorized, so we can compute payoff and profit across a vector or grid:
>>> from pyfinance import options as op >>> spread = op.BearSpread(St=np.array([2100, 2000, 1900]), ... K1=1950., K2=2050., ... price1=56.01, price2=107.39) >>> spread.payoff() array([ 0., 50., 100.]) >>> spread.profit() array([-51.38, -1.38, 48.62])
The utils.py
module contains odds-and-ends utilities.
>>> from pyfinance import utils # Generate 7 unique 5-letter mutual fund tickers >>> utils.random_tickers(length=5, n_tickers=7, endswith='X') ['JXNQX', 'DPTJX', 'WAKOX', 'DZIHX', 'MDYXX', 'HSKWX', 'IDMZX'] # Same for ETFs >>> utils.random_tickers(3, 8) ['FIS', 'FNN', 'FZC', 'PWV', 'PBA', 'RDG', 'BKY', 'CDW'] # Five-asset portfolio leveraged 1.5x. >>> utils.random_weights(size=5, sumto=1.5) array([0.3263, 0.1763, 0.4703, 0.4722, 0.0549]) # Two 7-asset portfolios leverage 1.0x and 1.5x, respectively. >>> utils.random_weights(size=(2, 7), sumto=[1., 1.5]) array([[0.1418, 0.2007, 0.0255, 0.2575, 0.0929, 0.2272, 0.0544], [0.3041, 0.109 , 0.2561, 0.2458, 0.3001, 0.0333, 0.2516]]) >>> utils.random_weights(size=(2, 7), sumto=[1., 1.5]).sum(axis=1) array([1. , 1.5]) # Convert Pandas offset alises to periods per year. >>> from pyfinance import utils >>> utils.get_anlz_factor('M') 12.0 >>> utils.get_anlz_factor('BQS-DEC') 4.0
API
For in-depth call syntaxes, see the source docstrings.
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