Build profiles: fast-debug, release, annotate#
Profiles provide canonical preset build options, while keeping explicit user-provided arguments authoritative.
Profiles:
fast-debug: optimize for iteration speed (debug-friendly)release: optimize for runtime speedannotate: generate the Cython HTML annotation report
This example compiles the same snippet under different profiles and prints the resulting cache keys (they differ because build options differ).
What this example demonstrates:
Profiles change build options → cache keys differ deterministically.
Explicit user arguments override profile defaults (strict precedence).
Annotation builds may generate an HTML report; we show where it is stored.
# Authors: The scikit-plots developers
# SPDX-License-Identifier: BSD-3-Clause
def _print_result(label: str, r: Any) -> None:
"""Print a compact BuildResult summary (stable fields only)."""
print(f"\n[{label}]")
print(" module_name :", r.module_name)
print(" key :", r.key)
print(" used_cache :", r.used_cache)
print(" artifact :", r.artifact_path)
# meta keys are stable across our devkit; use .get defensively.
meta = getattr(r, "meta", {}) or {}
print(" profile :", meta.get("profile", None))
print(" annotate :", meta.get("annotate", None))
print(" language :", meta.get("language", None))
cargs = meta.get("extra_compile_args", None)
largs = meta.get("extra_link_args", None)
directives = meta.get("compiler_directives", None)
if cargs is not None:
print(" extra_compile_args:", cargs)
if largs is not None:
print(" extra_link_args :", largs)
if directives is not None:
# Print a small, deterministic subset if huge.
if isinstance(directives, dict):
keys = sorted(directives.keys())
subset = {k: directives[k] for k in keys[:10]}
print(" compiler_directives (subset):", subset)
else:
print(" compiler_directives:", directives)
Generate python Module from python#
report = cython.check_build_prereqs(numpy=False)
if not report.get('cython', {}).get('ok'):
# sys.exit("Skipping compilation because build prerequisites are missing.")
print("Skipping compilation because build prerequisites are missing.")
problems = report.get("problems", [])
if problems:
print("Problems:", problems)
else:
source = "def f(int n):\n return n*n\n"
# 1) Compile under three profiles.
r_fast = cython.compile_and_load_result(source, profile="fast-debug", verbose=0)
r_rel = cython.compile_and_load_result(source, profile="release", verbose=0)
# annotate profile already requests annotation generation; we keep annotate=True explicit
# to demonstrate that explicit user args remain authoritative and documented.
r_ann = cython.compile_and_load_result(source, profile="annotate", annotate=True, view_annotate=False, use_cache=True, verbose=1, force_rebuild=True)
html = Path(r_ann.build_dir) / f"{r_ann.module_name}.html"
print("HTML:", html)
print("exists:", html.exists())
# 2) Keys differ deterministically.
print("fast-debug key:", r_fast.key)
print("release key:", r_rel.key)
print("annotate key:", r_ann.key)
print("\nKey comparisons:")
print(" fast vs release :", r_fast.key != r_rel.key)
print(" fast vs annotate:", r_fast.key != r_ann.key)
print(" release vs annotate:", r_rel.key != r_ann.key)
# 3) Sanity: compiled function works.
print("\nf(10) fast-debug:", r_fast.module.f(10))
print("f(10) release :", r_rel.module.f(10))
print("f(10) annotate :", r_ann.module.f(10))
# 4) Show what options differ (strictly from meta).
_print_result("fast-debug", r_fast)
_print_result("release", r_rel)
_print_result("annotate", r_ann)
# 5) Show where annotation lives (if present).
# We do not assume a fixed filename; we check metadata.
ann_meta = getattr(r_ann, "meta", {}) or {}
ann_path = ann_meta.get("annotate_html", None) or ann_meta.get("annotation_html", None)
if ann_path:
print("\nAnnotation HTML report:")
print(" ", ann_path)
else:
print("\nAnnotation HTML report not recorded in metadata for this build.")
# 6) Demonstrate precedence: explicit args override profile defaults.
# Example: even under "release", you can force annotate=False explicitly.
r_rel_no_ann = cython.compile_and_load_result(source, profile="release", annotate=False, verbose=0)
print("\nPrecedence demo: explicit annotate=False under release")
print(" key:", r_rel_no_ann.key)
print(" annotate in meta:", (getattr(r_rel_no_ann, "meta", {}) or {}).get("annotate", None))
Compiling /home/circleci/.cache/scikitplot/cython/f132522780a853ce622cc4e594e1d1d8a2b3000ea93ae758f274f2f3c17048ef/scikitplot_cython_f132522780a853ce.pyx because it changed.
[1/1] Cythonizing /home/circleci/.cache/scikitplot/cython/f132522780a853ce622cc4e594e1d1d8a2b3000ea93ae758f274f2f3c17048ef/scikitplot_cython_f132522780a853ce.pyx
HTML: /home/circleci/.cache/scikitplot/cython/f132522780a853ce622cc4e594e1d1d8a2b3000ea93ae758f274f2f3c17048ef/scikitplot_cython_f132522780a853ce.html
exists: True
fast-debug key: dcc07d0ff95c10ef924ee02075afa890c10f71233b0ae5e57698b8cde86d0b05
release key: ffe085a82700e9551549a99938c76fa742845298370db4b9b703187ff09d8efd
annotate key: f132522780a853ce622cc4e594e1d1d8a2b3000ea93ae758f274f2f3c17048ef
Key comparisons:
fast vs release : True
fast vs annotate: True
release vs annotate: True
f(10) fast-debug: 100
f(10) release : 100
f(10) annotate : 100
[fast-debug]
module_name : scikitplot_cython_dcc07d0ff95c10ef
key : dcc07d0ff95c10ef924ee02075afa890c10f71233b0ae5e57698b8cde86d0b05
used_cache : True
artifact : /home/circleci/.cache/scikitplot/cython/dcc07d0ff95c10ef924ee02075afa890c10f71233b0ae5e57698b8cde86d0b05/scikitplot_cython_dcc07d0ff95c10ef.cpython-312-x86_64-linux-gnu.so
profile : fast-debug
annotate : False
language : None
extra_compile_args: ['-O0', '-g']
extra_link_args : []
compiler_directives (subset): {'boundscheck': True, 'cdivision': False, 'embedsignature': True, 'initializedcheck': True, 'language_level': 3, 'wraparound': True}
[release]
module_name : scikitplot_cython_ffe085a82700e955
key : ffe085a82700e9551549a99938c76fa742845298370db4b9b703187ff09d8efd
used_cache : False
artifact : /home/circleci/.cache/scikitplot/cython/ffe085a82700e9551549a99938c76fa742845298370db4b9b703187ff09d8efd/scikitplot_cython_ffe085a82700e955.cpython-312-x86_64-linux-gnu.so
profile : release
annotate : False
language : None
extra_compile_args: ['-O3', '-DNDEBUG']
extra_link_args : []
compiler_directives (subset): {'boundscheck': False, 'cdivision': True, 'embedsignature': True, 'initializedcheck': False, 'language_level': 3, 'wraparound': False}
[annotate]
module_name : scikitplot_cython_f132522780a853ce
key : f132522780a853ce622cc4e594e1d1d8a2b3000ea93ae758f274f2f3c17048ef
used_cache : False
artifact : /home/circleci/.cache/scikitplot/cython/f132522780a853ce622cc4e594e1d1d8a2b3000ea93ae758f274f2f3c17048ef/scikitplot_cython_f132522780a853ce.cpython-312-x86_64-linux-gnu.so
profile : annotate
annotate : True
language : None
extra_compile_args: ['-O0', '-g']
extra_link_args : []
compiler_directives (subset): {'boundscheck': True, 'embedsignature': True, 'initializedcheck': True, 'language_level': 3, 'wraparound': True}
Annotation HTML report:
/home/circleci/.cache/scikitplot/cython/f132522780a853ce622cc4e594e1d1d8a2b3000ea93ae758f274f2f3c17048ef/scikitplot_cython_f132522780a853ce.html
Precedence demo: explicit annotate=False under release
key: ffe085a82700e9551549a99938c76fa742845298370db4b9b703187ff09d8efd
annotate in meta: False
import json
import shutil
import textwrap
from pprint import pprint
if report.get('cython', {}).get('ok'):
# pprint(textwrap.wrap(str(r_ann)))
print("\nBuildResult (metadata):")
print(" module_name :", r_ann.module_name)
print(" cache key :", r_ann.key)
print(" build dir :", r_ann.build_dir)
print(" artifact :", r_ann.artifact_path)
print(" used_cache :", r_ann.used_cache)
print(" created_utc :", r_ann.created_utc)
print(" Annotation :", r_ann.meta["annotate"])
print(" HTML report :", r_ann.meta["annotate_html"])
BuildResult (metadata):
module_name : scikitplot_cython_f132522780a853ce
cache key : f132522780a853ce622cc4e594e1d1d8a2b3000ea93ae758f274f2f3c17048ef
build dir : /home/circleci/.cache/scikitplot/cython/f132522780a853ce622cc4e594e1d1d8a2b3000ea93ae758f274f2f3c17048ef
artifact : /home/circleci/.cache/scikitplot/cython/f132522780a853ce622cc4e594e1d1d8a2b3000ea93ae758f274f2f3c17048ef/scikitplot_cython_f132522780a853ce.cpython-312-x86_64-linux-gnu.so
used_cache : False
created_utc : 2026-06-26T18:49:06Z
Annotation : True
HTML report : /home/circleci/.cache/scikitplot/cython/f132522780a853ce622cc4e594e1d1d8a2b3000ea93ae758f274f2f3c17048ef/scikitplot_cython_f132522780a853ce.html
Display annotate Profile to see the actual C code#
cython –annotate <pyx file> will output an html report where each line of the the pyx file is color coded as to the amount of back and forth to the python interpreter that is required, and each line can be expanded to see the actual C code generated.
def read_html_file(file_path):
with open(file_path, 'r') as file:
html_content = file.read()
return html_content
if report.get('cython', {}).get('ok'):
if ann_path:
# print(HTML(read_html_file(ann_path)).data[-8000:])
from IPython.display import display, HTML, IFrame
# display(IFrame(src=ann_path, width=700, height=600))
# display(HTML('<h1>Hello, world!</h1>'))
display(HTML(read_html_file(ann_path)))
<IPython.core.display.HTML object>
Viewing the HTML web file to see the actual C code#
cython –annotate <pyx file> will output an html report where each line of the the pyx file is color coded as to the amount of back and forth to the python interpreter that is required, and each line can be expanded to see the actual C code generated.
# import module
# import webbrowser
# open html file
# webbrowser.open(ann_path)
# Sample Output:
r"""
Generated by Cython 3.2.4
Yellow lines hint at Python interaction.
Click on a line that starts with a "+" to see the C code that Cython generated for it.
Raw output: scikitplot_cython_ddc7a5b27b5b1257.c
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Total running time of the script: (0 minutes 1.562 seconds)
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