brodul · July 15, 2021 07:05
diff --git a/index.html b/index.html
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                # Practical Closures

                Andraž Brodnik @brodul
                </textarea>
            </section>
            <section data-auto-animate>
                <h2 data-id="code-title">Scope 101</h2>
                <pre data-id="code-animation"><code class="hlpy" data-trim data-line-numbers="|3,4|1|6,7"><script type="text/template">
                    a = 2  # outer scope

                    def sum2(b):
                        return a + b  # local scope

                    sum2(3)
                    # returns: 5
                </script></code></pre>
            </section>
            <section data-markdown>
                <textarea data-template>
                # Closures

 A Closure is a function object that remembers values in enclosing scopes even if they are not present in memory.
                </textarea>
            </section>
            <section data-auto-animate>
                <h2 data-id="code-title">What are closures?</h2>
                <pre data-id="code-animation"><code class="hlpy" data-trim data-line-numbers="|1,11|5-9|1,3,6,8|"><script type="text/template">
                    def get_max_value_validator(max_value):

                        # max_value is outer/enclosing scope

                        def inner_fun(value):
                            if value > max_value:
                                raise ValueError(
                                    f"{value} is bigger than {max_value}")
                            return value

                        return inner_fun

                </script></code></pre>
            </section>
            <section data-auto-animate>
                <h2 data-id="code-title">What are closures?</h2>
                <pre data-id="code-animation"><code class="hlpy" data-trim data-line-numbers="|1|"><script type="text/template">
                    shoe_size_validator = get_max_value_validator(42)
                    shoe_size_validator(40)
                    # returns: 40
                    shoe_size_validator(55)
                    # raises: ValueError: 55 is bigger than 42
                </script></code></pre>
            </section>
            <section data-auto-animate>
                <h2 data-id="code-title">Special case with "partial"</h2>
                <pre data-id="code-animation"><code class="hlpy" data-trim data-line-numbers="|3-7|"><script type="text/template">
                    from functools import partial

                    def max_value_validator(value, max_value):
                        if value > max_value:
                            raise ValueError(
                                f"{value} is bigger than {max_value}")
                        return value

                    shoe_size_validator = partial(
                        max_value_validator, max_value=42)
                </script></code></pre>
            </section>

            <section data-auto-animate>
                <h4 data-id="code-title">Calling an external command</h4>
                <pre data-id="code-animation"><code class="hlpy" data-trim data-line-numbers="|1-3|5-11"><script type="text/template">
                    LOG = logging.getLogger()
                    tempdir_ = tempfile.mkdtemp()
                    env = {"PATH": os.getenv("PATH")}

                    LOG.info("Running docker image ls")

                    result = subprocess.run(["docker", "image", "ls"],
                        capture_output=True, env=env, cwd=tempdir_)

                    LOG.info("'docker image ls' exited with %s",
                        result.returncode)
                </script></code></pre>
            </section>
            <section data-auto-animate>
                <!-- <h4 data-id="code-title">Problem</h4> -->
                <pre data-id="code-animation"><code class="hlpy" data-trim data-line-numbers="|1,13|6-11|1|3-4|3-4,8-9"><script type="text/template">
                    def get_docker_command(env={}):

                        env = {"PATH": os.getenv("PATH")}.update(env)
                        tempdir_ = tempfile.mkdtemp()

                        def inner_fun(*args):
                            LOG.info("Running docker command ...")
                            result = subprocess.run(["docker"] + list(args),
                                capture_output=True, env=env, cwd=tempdir_)
                            LOG.info("Command output ... %s", result)
                            return result

                        return inner_fun
                </script></code></pre>
            </section>
            <section data-auto-animate>
                <!-- <h4 data-id="code-title">Problem</h4> -->
                <pre data-id="code-animation"><code class="hlpy" data-trim data-line-numbers=""><script type="text/template">
                    docker_cmd = get_docker_command(env={"SOME_ENV": "biz"})

                    result = docker_cmd("image", "ls")
                </script></code></pre>
            </section>
            <section data-markdown>
                <textarea data-template>
                # Practical Closures

                Andraž Brodnik @brodul
                </textarea>
            </section>

        </div>
    </div>

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 </body>

 </html>
	<!doctype html>
	<html>

	<head>
	<meta charset="utf-8">
	<meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=no">

	<title>@brodul</title>

	<link rel="stylesheet" href="dist/reset.css">
	<link rel="stylesheet" href="dist/reveal.css">
	<link rel="stylesheet" href="dist/theme/black.css">

	<!-- Theme used for syntax highlighted code -->
	<link rel="stylesheet" href="plugin/highlight/monokai.css">
	</head>

	<body>
	<div class="reveal">
	<div class="slides">
	<section data-markdown>
	<textarea data-template>
	# Practical Closures

	Andraž Brodnik @brodul
	</textarea>
	</section>
	<section data-auto-animate>
	<h2 data-id="code-title">Scope 101</h2>
	<pre data-id="code-animation"><code class="hlpy" data-trim data-line-numbers="\|3,4\|1\|6,7"><script type="text/template">
	a = 2 # outer scope

	def sum2(b):
	return a + b # local scope

	sum2(3)
	# returns: 5
	</script></code></pre>
	</section>
	<section data-markdown>
	<textarea data-template>
	# Closures

	A Closure is a function object that remembers values in enclosing scopes even if they are not present in memory.
	</textarea>
	</section>
	<section data-auto-animate>
	<h2 data-id="code-title">What are closures?</h2>
	<pre data-id="code-animation"><code class="hlpy" data-trim data-line-numbers="\|1,11\|5-9\|1,3,6,8\|"><script type="text/template">
	def get_max_value_validator(max_value):

	# max_value is outer/enclosing scope

	def inner_fun(value):
	if value > max_value:
	raise ValueError(
	f"{value} is bigger than {max_value}")
	return value

	return inner_fun

	</script></code></pre>
	</section>
	<section data-auto-animate>
	<h2 data-id="code-title">What are closures?</h2>
	<pre data-id="code-animation"><code class="hlpy" data-trim data-line-numbers="\|1\|"><script type="text/template">
	shoe_size_validator = get_max_value_validator(42)
	shoe_size_validator(40)
	# returns: 40
	shoe_size_validator(55)
	# raises: ValueError: 55 is bigger than 42
	</script></code></pre>
	</section>
	<section data-auto-animate>
	<h2 data-id="code-title">Special case with "partial"</h2>
	<pre data-id="code-animation"><code class="hlpy" data-trim data-line-numbers="\|3-7\|"><script type="text/template">
	from functools import partial

	def max_value_validator(value, max_value):
	if value > max_value:
	raise ValueError(
	f"{value} is bigger than {max_value}")
	return value

	shoe_size_validator = partial(
	max_value_validator, max_value=42)
	</script></code></pre>
	</section>

	<section data-auto-animate>
	<h4 data-id="code-title">Calling an external command</h4>
	<pre data-id="code-animation"><code class="hlpy" data-trim data-line-numbers="\|1-3\|5-11"><script type="text/template">
	LOG = logging.getLogger()
	tempdir_ = tempfile.mkdtemp()
	env = {"PATH": os.getenv("PATH")}

	LOG.info("Running docker image ls")

	result = subprocess.run(["docker", "image", "ls"],
	capture_output=True, env=env, cwd=tempdir_)

	LOG.info("'docker image ls' exited with %s",
	result.returncode)
	</script></code></pre>
	</section>
	<section data-auto-animate>
	<!-- <h4 data-id="code-title">Problem</h4> -->
	<pre data-id="code-animation"><code class="hlpy" data-trim data-line-numbers="\|1,13\|6-11\|1\|3-4\|3-4,8-9"><script type="text/template">
	def get_docker_command(env={}):

	env = {"PATH": os.getenv("PATH")}.update(env)
	tempdir_ = tempfile.mkdtemp()

	def inner_fun(*args):
	LOG.info("Running docker command ...")
	result = subprocess.run(["docker"] + list(args),
	capture_output=True, env=env, cwd=tempdir_)
	LOG.info("Command output ... %s", result)
	return result

	return inner_fun
	</script></code></pre>
	</section>
	<section data-auto-animate>
	<!-- <h4 data-id="code-title">Problem</h4> -->
	<pre data-id="code-animation"><code class="hlpy" data-trim data-line-numbers=""><script type="text/template">
	docker_cmd = get_docker_command(env={"SOME_ENV": "biz"})

	result = docker_cmd("image", "ls")
	</script></code></pre>
	</section>
	<section data-markdown>
	<textarea data-template>
	# Practical Closures

	Andraž Brodnik @brodul
	</textarea>
	</section>

	</div>
	</div>

	<script src="dist/reveal.js"></script>
	<script src="plugin/notes/notes.js"></script>
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