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<h3>Part 1</h3>
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<p>A <strong>basic example</strong> of retrieving CPI inflation data using the sdmx1 library, converting to pandas, and plotting results.</p>
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<h3>Part 2</h3>
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<p>How to <strong>find datasets and parameters</strong> using dataflow and codelist methods, plus <strong>direct API access</strong> with requests.</p>
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<h3>Part 3</h3>
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<p>Practical examples: <strong>WEO forecasts, commodity prices</strong>, and <strong>bulk downloads</strong> with requests.</p>
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<h2>IMF API with Python: Practical Examples</h2>
<p>Parts 1 and 2 covered the basics of retrieving data and discovering datasets. Here we apply both—combining the discovery tools from Part 2 with practical workflows—to work through three examples: economic forecasts, commodity prices, and bulk downloads.</p>
<hr class="section-bar accent-blue">
<h3>Economic Forecasts (WEO)</h3>
<p>The World Economic Outlook (WEO) dataset contains IMF projections for over 40 indicators—GDP, inflation, unemployment, government debt, current account, and more—covering nearly every country. Data includes historical values and forecasts several years forward.</p>
<p>In[1]:</p>
<pre><code class="python">import sdmx
import pandas as pd
import matplotlib.pyplot as plt
import logging
logging.getLogger('sdmx').setLevel(logging.ERROR)
IMF_DATA = sdmx.Client('IMF_DATA')</code></pre>
<p>We can use the discovery methods from Part 2 to explore the WEO dataset and find the right indicator code. Here we look at the dataset's dimensions and search for GDP-related indicators:</p>
<p>In[2]:</p>
<pre><code class="python"># Explore WEO structure (Part 2 techniques)
f = IMF_DATA.dataflow('WEO')
dsd = list(f.structure.values())[0]
print('Dimensions:', [d.id for d in dsd.dimensions.components])
# Search for GDP growth indicators
for name, cl in f.codelist.items():
codes = sdmx.to_pandas(cl)
matches = codes[codes.str.contains('GDP.*constant', case=False)]
if not matches.empty:
print(f'\n{matches}')</code></pre>
<p>Out[2]:</p>
<pre>Dimensions: ['COUNTRY', 'SUBJECT', 'FREQUENCY', 'TIME_PERIOD']
SUBJECT
NGDP_R Gross domestic product, constant prices (National currency)
NGDP_RPCH Gross domestic product, constant prices (Percent change)
Name: ..., dtype: object</pre>
<p>The indicator we want is <code>NGDP_RPCH</code>—annual percent change in real GDP. Let's compare Thailand and Vietnam, two fast-growing Southeast Asian economies:</p>
<p>In[3]:</p>
<pre><code class="python"># Real GDP growth: Thailand vs. Vietnam
key = 'THA+VNM.NGDP_RPCH.A'
data_msg = IMF_DATA.data('WEO', key=key)
df = sdmx.to_pandas(data_msg).reset_index()
df = df.set_index(['TIME_PERIOD', 'COUNTRY'])['value'].unstack()
df.index = pd.to_datetime(df.index, format='%Y')
df = df.sort_index()
df = df.rename(columns={'THA': 'Thailand', 'VNM': 'Vietnam'})</code></pre>
<p>The DataFrame includes both historical values and IMF projections extending several years beyond the present. We can plot them with dashed lines to distinguish forecasts:</p>
<p>In[4]:</p>
<pre><code class="python">fig, ax = plt.subplots()
forecast_start = pd.Timestamp('2025')
for col in df.columns:
hist = df.loc[df.index < forecast_start, col]
proj = df.loc[df.index >= forecast_start, col]
line, = ax.plot(hist.index, hist, linewidth=1.5, label=col)
ax.plot(proj.index, proj, linewidth=1.5,
linestyle='--', color=line.get_color())
ax.axhline(0, color='gray', linewidth=0.5)
ax.set_title('Real GDP Growth (%, annual)')
ax.legend(frameon=False)
ax.set_xlabel('Source: IMF World Economic Outlook')</code></pre>
<p>Out[4]:</p>
<picture><source srcset="images/imf_gdp_growth.webp" type="image/webp"><img decoding="async" src="images/imf_gdp_growth.png" alt="Thailand vs Vietnam GDP Growth from WEO" loading="lazy" width="558" height="443"/></picture>
<p>Vietnam has sustained higher growth rates over most of this period, with both countries hit hard by COVID-19 in 2020–2021. Other popular WEO indicators include <code>PCPIPCH</code> (CPI inflation), <code>LUR</code> (unemployment rate), and <code>GGXWDG_NGDP</code> (government debt as % of GDP).</p>
<p>Note that the SDMX API only serves the <strong>latest WEO edition</strong>. The IMF publishes the WEO twice a year (April and October), but older editions are not available through the API—the dataflow is overwritten each cycle. To access archived WEO vintages (back to 2007), download them from the <a href="https://www.imf.org/en/Publications/SPROLLs/world-economic-outlook-databases">WEO Database page</a> or use a package like <a href="https://pypi.org/project/weo/">weo</a>.</p>
<h4>Distinguishing Forecasts from Actuals</h4>
<p>WEO data mixes historical values and projections, but the API does not flag which is which in the main data response. To find the boundary, request the <code>LATEST_ACTUAL_ANNUAL_DATA</code> attribute. This returns the last year of actual data for each country–indicator pair; any year after that is a forecast.</p>
<p>In[5a]:</p>
<pre><code class="python">import requests
# Request the forecast boundary attribute via SDMX JSON
url = ("https://api.imf.org/external/sdmx/3.0/data/"
"dataflow/IMF.RES/WEO/~/*"
"?attributes=LATEST_ACTUAL_ANNUAL_DATA"
"&detail=serieskeysonly")
resp = requests.get(url, headers={"Accept": "application/json"})
meta = resp.json()
# The attribute is in dimensionGroupAttributes
attrs = meta['dataSets'][0]['dimensionGroupAttributes']
# Each key is "{country_idx}:{indicator_idx}::", value is [[year]]
# Map dimension indices back to codes
dims = meta['structure']['dimensions']['observation']
countries = {str(i): c['id']
for i, c in enumerate(dims[0]['values'])}
indicators = {str(i): ind['id']
for i, ind in enumerate(dims[1]['values'])}
estimates_start = {}
for key, val in attrs.items():
parts = key.split(':')
iso = countries[parts[0]]
ind = indicators[parts[1]]
year_str = val[0][0]
# Handle fiscal year format: "FY2023/24" -> 2023
if year_str.startswith('FY'):
year = int(year_str[2:6])
else:
year = int(year_str)
estimates_start[(iso, ind)] = year
# Example: last actual year for US real GDP growth
print(f"USA NGDP_RPCH: actuals through "
f"{estimates_start[('USA', 'NGDP_RPCH')]}")</code></pre>
<p>Out[5a]:</p>
<pre>USA NGDP_RPCH: actuals through 2024</pre>
<p>With this boundary, you can split any WEO series into historical data and forecasts programmatically—no hard-coding of dates needed. About 19 countries (including India, Egypt, and Ethiopia) use fiscal years in the format <code>FY2023/24</code>; the first year is the conventional cutoff.</p>
<p>To explore how WEO forecasts have evolved across editions, see the <a href="imfweo.html">WEO Forecast Tracker</a>.</p>
<hr class="section-bar accent-blue">
<h3>Commodity Prices (PCPS)</h3>
<p>The Primary Commodity Price System (PCPS) dataset tracks world benchmark prices for over 100 commodities. Let's explore its structure and search for metals:</p>
<p>In[5]:</p>
<pre><code class="python"># Explore PCPS structure
f = IMF_DATA.dataflow('PCPS')
dsd = list(f.structure.values())[0]
print('Dimensions:', [d.id for d in dsd.dimensions.components])
# Search for aluminum and copper
for name, cl in f.codelist.items():
codes = sdmx.to_pandas(cl)
matches = codes[codes.str.contains('Aluminum|Copper', case=False)]
if not matches.empty:
print(f'\n{matches}')</code></pre>
<p>Out[5]:</p>
<pre>Dimensions: ['FREQ', 'REF_AREA', 'COMMODITY', 'UNIT_MEASURE', 'TIME_PERIOD']
COMMODITY
PALUM Aluminum, 99.5% minimum purity, LME spot price, ...
PCOPP Copper, grade A cathode, LME spot price, CIF Eur...
Name: ..., dtype: object</pre>
<p>PCPS reports global benchmark prices—the reference area is <code>W00</code> (world), so there are no country-specific prices. The key places frequency first, then reference area, commodity, and unit:</p>
<p>In[6]:</p>
<pre><code class="python"># Aluminum and copper monthly prices from 2000
key = 'M.W00.PALUM+PCOPP.USD'
data_msg = IMF_DATA.data('PCPS', key=key,
params={'startPeriod': 2000})
df = sdmx.to_pandas(data_msg).reset_index()
df = df.set_index(['TIME_PERIOD', 'COMMODITY'])['value'].unstack()
df.index = pd.to_datetime(df.index)
df = df.sort_index()
df.columns = ['Aluminum ($/mt)', 'Copper ($/mt)']</code></pre>
<p>With two metals on different scales (aluminum ~$2,500/mt, copper ~$9,000/mt), a dual-axis chart shows both clearly:</p>
<p>In[7]:</p>
<pre><code class="python">fig, ax1 = plt.subplots()
ax1.plot(df.index, df['Aluminum ($/mt)'],
color='#7f8c8d', label='Aluminum')
ax1.set_ylabel('Aluminum ($/mt)')
ax2 = ax1.twinx()
ax2.plot(df.index, df['Copper ($/mt)'],
color='#b87333', label='Copper')
ax2.set_ylabel('Copper ($/mt)')
ax1.set_title('Commodity Prices')
ax1.set_xlabel('Source: IMF Primary Commodity Prices (PCPS)')
lines = ax1.lines + ax2.lines
ax1.legend(lines, [l.get_label() for l in lines],
loc='upper left', frameon=False)</code></pre>
<p>Out[7]:</p>
<picture><source srcset="images/imf_commodities.webp" type="image/webp"><img decoding="async" src="images/imf_commodities.png" alt="Aluminum and Copper Commodity Prices" loading="lazy" width="558" height="443"/></picture>
<p>Both metals track global industrial activity, but copper's sharper swings reflect its role as a leading economic indicator. Other key commodity codes include <code>PGOLD</code> (gold), <code>POILAPSP</code> (crude oil), <code>PNGAS</code> (natural gas), and <code>PWHEAMT</code> (wheat). Use the codelist methods from Part 2 to browse the full list.</p>
<hr class="section-bar accent-blue">
<h3>Bulk Download with Requests</h3>
<p>For larger downloads—or if you prefer to skip the sdmx1 dependency—the same API accepts plain HTTP requests. Ask for CSV format and you get a pandas-ready response. As covered in Part 2, the URL follows the pattern <code>https://api.imf.org/external/sdmx/3.0/data/dataflow/{agency}/{dataflow}/{version}/{key}</code>.</p>
<p>Here we download the entire WEO dataset from 2020 onward. The wildcard <code>*</code> in the key position requests all countries and indicators:</p>
<p>In[11]:</p>
<pre><code class="python">import requests
import io
url = ("https://api.imf.org/external/sdmx/3.0/data/"
"dataflow/IMF.RES/WEO/~/*"
"?c[TIME_PERIOD]=ge:2020-01")
resp = requests.get(url, headers={"Accept": "text/csv"})
df = pd.read_csv(io.StringIO(resp.text), low_memory=False)
print(f"{len(df):,} rows, {df['COUNTRY'].nunique()} countries, "
f"{df['INDICATOR'].nunique()} indicators")</code></pre>
<p>Out[11]:</p>
<pre>86,981 rows, 208 countries, 145 indicators</pre>
<p>With the full dataset in memory, filtering is straightforward. For example, G7 real GDP growth:</p>
<p>In[12]:</p>
<pre><code class="python">g7 = ['USA', 'GBR', 'DEU', 'FRA', 'JPN', 'ITA', 'CAN']
gdp = df[df['INDICATOR'] == 'NGDP_RPCH'].copy()
gdp = gdp[gdp['COUNTRY'].isin(g7)]
gdp = gdp.set_index(['TIME_PERIOD', 'COUNTRY'])['OBS_VALUE'].unstack()
gdp.sort_index().round(1)</code></pre>
<p>Out[12]:</p>
<pre>COUNTRY CAN DEU FRA GBR ITA JPN USA
2020 -5.0 -4.1 -7.6 -10.3 -8.9 -4.2 -2.1
2021 6.0 3.9 6.8 8.6 8.9 2.7 6.2
2022 4.2 1.8 2.8 4.8 4.8 1.0 2.5
2023 1.5 -0.9 1.6 0.4 0.7 1.2 2.9
2024 1.6 -0.5 1.1 1.1 0.7 0.1 2.8
2025 1.2 0.2 0.7 1.3 0.5 1.1 2.0
2026 1.5 0.9 0.9 1.3 0.8 0.6 2.1
...</pre>
<p>This approach downloads about 8 MB and takes a few seconds. It is useful when you want many indicators or countries at once, or when you want to avoid installing sdmx1. The same pattern works for other dataflows—swap in <code>IMF.STA/CPI</code> for CPI data or <code>IMF.STA/BOP</code> for balance of payments.</p>
<hr class="section-bar accent-blue">
<h3>Key Concepts</h3>
<ul>
<li>The discovery methods from Part 2—<code>dataflow()</code>, <code>dsd.dimensions</code>, and codelist searches—are essential for working with new datasets</li>
<li>WEO provides IMF forecasts, valuable for projections and scenario analysis</li>
<li>PCPS provides world benchmark commodity prices; the reference area <code>W00</code> covers all series</li>
<li>The sdmx1 library also supports ECB, BIS, OECD, and many other SDMX providers—run <code>sdmx.list_sources()</code> to see all of them</li>
<li>For bulk downloads or to avoid dependencies, the API also accepts plain <code>requests</code> with <code>Accept: text/csv</code>—see Part 2 for the URL pattern and gotchas</li>
<li>Always call <code>.sort_index()</code> after converting the time index—SDMX responses are not guaranteed to be in chronological order</li>
</ul>
<hr class="section-bar accent-blue">
<h3>Additional Resources</h3>
<ul>
<li><a href="https://pypi.org/project/sdmx1/">sdmx1 on PyPI</a> — Installation and basic documentation</li>
<li><a href="https://sdmx1.readthedocs.io/">sdmx1 documentation</a> — Full library reference, including the list of supported providers</li>
<li><a href="https://data.imf.org/">IMF Data Portal</a> — Browse available IMF datasets interactively</li>
</ul>
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