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Alexander Hess 2020-02-05 18:25:39 +01:00
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01_elements_00_lecture.ipynb
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}
},
"source": [
"### Value"
"### Value / \"Meaning\""
]
},
{
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}
},
"source": [
"Almost trivially, every object also has a value to which it **evaluates** when referenced. We think of the value as the **conceptual idea** of what the $0$s and $1$s in the bag mean to *humans*.\n",
"Almost trivially, every object also has a value to which it **evaluates** when referenced. We think of the value as the **conceptual idea** of what the $0$s and $1$s in the bag mean to *humans*. In other words, an object's value regards its *semantic* meaning.\n",
"\n",
"For built-in data types, Python prints out an object's value as a so-called **[literal](https://docs.python.org/3/reference/lexical_analysis.html#literals)**: This means that we may copy and paste the value back into a code cell and create a *new* object with the *same* value."
]
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}
},
"source": [
"Variable names may contain upper and lower case letters, numbers, and underscores (i.e., `_`) and be as long as we want them to be. However, they must not begin with a number. Also, they must not be any of Python's built-in **[keywords](https://docs.python.org/3/reference/lexical_analysis.html#keywords)**.\n",
"Variable names may contain upper and lower case letters, numbers, and underscores (i.e., `_`) and be as long as we want them to be. However, they must not begin with a number. Also, they must not be any of Python's built-in **[keywords](https://docs.python.org/3/reference/lexical_analysis.html#keywords)** like `for` or `if`.\n",
"\n",
"Variable names should be chosen such that they do not need any more documentation and are self-explanatory. A widespread convention is to use so-called **[snake\\_case](https://en.wikipedia.org/wiki/Snake_case)**: Keep everything lowercase and use underscores to separate words.\n",
"\n",
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" - include [built-in functions](https://docs.python.org/3/library/functions.html) like [print()](https://docs.python.org/3/library/functions.html#print), [sum()](https://docs.python.org/3/library/functions.html#sum), or [len()](https://docs.python.org/3/library/functions.html#len)\n",
"\n",
"\n",
"- flow control (cf., [Chapter 3](https://nbviewer.jupyter.org/github/webartifex/intro-to-python/blob/master/03_conditionals_00_lecture.ipynb))\n",
"- flow control (cf., [Chapter 3](https://nbviewer.jupyter.org/github/webartifex/intro-to-python/blob/master/03_conditionals_00_lecture.ipynb) and [Chapter 4](https://nbviewer.jupyter.org/github/webartifex/intro-to-python/blob/master/04_iteration_00_lecture.ipynb))\n",
" - expression of **business logic** or an **algorithm**\n",
" - conditional execution of parts of a program (e.g., `if` statements)\n",
" - repetitive execution of parts of a program (e.g., `for`-loops)"