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Add logging to a file
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‎notebooks/beginner/html/std_lib.html

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<pre>local now: 2018-09-19 22:00:35.202267
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utc now: 2018-09-19 20:00:35.202567
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2018 9 19 22 0 35
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<pre>local now: 2018-09-19 22:44:15.396930
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utc now: 2018-09-19 20:44:15.397085
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2018 9 19 22 44 15
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date: 2018-09-19
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time: 22:00:35.202267
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time: 22:44:15.396930
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<pre>2018/09/19-22:00:35
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date: 2018-09-19 time:22:00:35
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date: 2018-09-19 time:22:44:15
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<pre>tomorrow this time: 2018-09-20 22:00:35.202267
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<pre>tomorrow this time: 2018-09-20 22:44:15.396930
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tomorrow - now = 1 day, 0:00:00
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<pre>naive utc now: 2018-09-19 20:00:36.074664, tzinfo: None
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utc now: 2018-09-19 20:00:36.074664+00:00, tzinfo: UTC
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Paris: 2018-09-19 22:00:36.074664+02:00, tzinfo: Europe/Paris
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New York: 2018-09-19 16:00:36.074664-04:00, tzinfo: America/New_York
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<pre>naive utc now: 2018-09-19 20:44:16.308229, tzinfo: None
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utc now: 2018-09-19 20:44:16.308229+00:00, tzinfo: UTC
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Paris: 2018-09-19 22:44:16.308229+02:00, tzinfo: Europe/Paris
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New York: 2018-09-19 16:44:16.308229-04:00, tzinfo: America/New_York
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<pre>2018-09-19 22:00:36,127 | MyLogger | WARNING | Something bad is going to happen
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2018-09-19 22:00:36,128 | MyLogger | ERROR | Uups, it already happened
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<pre>2018-09-19 22:44:16,365 | MyLogger | WARNING | Something bad is going to happen
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2018-09-19 22:44:16,366 | MyLogger | ERROR | Uups, it already happened
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<h2 id="random-for-random-number-generation"><a href="https://docs.python.org/3/library/random.html"><code>random</code></a> for random number generation<a class="anchor-link" href="#random-for-random-number-generation">&#182;</a></h2>
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<h3 id="Logging-to-a-file">Logging to a file<a class="anchor-link" href="#Logging-to-a-file">&#182;</a></h3>
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<div class=" highlight hl-ipython3"><pre><span></span><span class="kn">import</span> <span class="nn">os</span>
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<span class="kn">import</span> <span class="nn">logging</span>
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<span class="c1"># This is only required for Jupyter notebook environment</span>
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<span class="kn">from</span> <span class="nn">importlib</span> <span class="k">import</span> <span class="n">reload</span>
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<span class="n">reload</span><span class="p">(</span><span class="n">logging</span><span class="p">)</span>
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<span class="n">logger</span> <span class="o">=</span> <span class="n">logging</span><span class="o">.</span><span class="n">getLogger</span><span class="p">(</span><span class="s1">&#39;MyFileLogger&#39;</span><span class="p">)</span>
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<span class="c1"># Let&#39;s define a file_handler for our logger</span>
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<span class="n">log_path</span> <span class="o">=</span> <span class="n">os</span><span class="o">.</span><span class="n">path</span><span class="o">.</span><span class="n">join</span><span class="p">(</span><span class="n">os</span><span class="o">.</span><span class="n">getcwd</span><span class="p">(),</span> <span class="s1">&#39;my_log.txt&#39;</span><span class="p">)</span>
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<span class="n">file_handler</span> <span class="o">=</span> <span class="n">logging</span><span class="o">.</span><span class="n">FileHandler</span><span class="p">(</span><span class="n">log_path</span><span class="p">)</span>
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< 10000 /code>12277+
<span class="c1"># And a nice format</span>
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<span class="n">formatter</span> <span class="o">=</span> <span class="n">logging</span><span class="o">.</span><span class="n">Formatter</span><span class="p">(</span><span class="s1">&#39;</span><span class="si">%(asctime)s</span><span class="s1"> | </span><span class="si">%(name)-12s</span><span class="s1"> | </span><span class="si">%(levelname)-10s</span><span class="s1"> | </span><span class="si">%(message)s</span><span class="s1">&#39;</span><span class="p">)</span>
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<span class="n">file_handler</span><span class="o">.</span><span class="n">setFormatter</span><span class="p">(</span><span class="n">formatter</span><span class="p">)</span>
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<span class="n">logger</span><span class="o">.</span><span class="n">addHandler</span><span class="p">(</span><span class="n">file_handler</span><span class="p">)</span>
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<span class="c1"># If you want to see it also in the console, add another handler for it</span>
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<span class="c1"># logger.addHandler(logging.StreamHandler())</span>
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<span class="n">logger</span><span class="o">.</span><span class="n">warning</span><span class="p">(</span><span class="s1">&#39;Oops something is going to happen&#39;</span><span class="p">)</span>
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<span class="n">logger</span><span class="o">.</span><span class="n">error</span><span class="p">(</span><span class="s1">&#39;John Doe visits our place&#39;</span><span class="p">)</span>
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</pre></div>
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</div>
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</div>
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</div>
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</div>
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<h2 id="random-for-random-number-generation"><a href="https://docs.python.org/3/library/random.html"><code>random</code></a> for random number generation<a class="anchor-link" href="#random-for-random-number-generation">&#182;</a></h2>
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</div>
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<pre>random integer between 1-100: 63
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random float between 0-1: 0.11984811411151686
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<pre>random integer between 1-100: 33
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random float between 0-1: 0.10137384902353497
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<div class=" highlight hl-ipython3"><pre><span></span><span class="kn">import</span> <span class="nn">re</span>

‎notebooks/beginner/std_lib.ipynb

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"logger.error('Uups, it already happened')"
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]
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},
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{
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"cell_type": "markdown",
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"metadata": {},
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"source": [
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"### Logging to a file"
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]
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},
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{
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"cell_type": "code",
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"execution_count": null,
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"metadata": {},
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"outputs": [],
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"source": [
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"import os\n",
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"import logging\n",
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"\n",
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"# This is only required for Jupyter notebook environment\n",
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"from importlib import reload\n",
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"reload(logging)\n",
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"\n",
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"logger = logging.getLogger('MyFileLogger')\n",
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"\n",
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"# Let's define a file_handler for our logger\n",
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"log_path = os.path.join(os.getcwd(), 'my_log.txt')\n",
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"file_handler = logging.FileHandler(log_path)\n",
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"\n",
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"# And a nice format\n",
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"formatter = logging.Formatter('%(asctime)s | %(name)-12s | %(levelname)-10s | %(message)s')\n",
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"file_handler.setFormatter(formatter)\n",
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"\n",
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"logger.addHandler(file_handler)\n",
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"\n",
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"# If you want to see it also in the console, add another handler for it\n",
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"# logger.addHandler(logging.StreamHandler())\n",
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"\n",
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"logger.warning('Oops something is going to happen')\n",
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"logger.error('John Doe visits our place')"
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]
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},
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{
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"cell_type": "markdown",
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"metadata": {},

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