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note about print tuple

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rasbt 2014-05-25 11:30:41 -04:00
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commit 3f28b768e0
1 changed files with 38 additions and 7 deletions
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45
tutorials/key_differences_between_python_2_and_3.ipynb
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@ -1,7 +1,7 @@
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@ -151,13 +151,13 @@
"<tr><td>generators</td>\n",
"<td>2.2.0a1</td>\n",
"<td>2.3</td>\n",
"<td><a class=\"pep reference external\" href=\"http://www.python.org/dev/peps/pep-0255\"><strong>PEP 255</strong></a>:\n",
"<td><a href=\"http://www.python.org/dev/peps/pep-0255\"><strong>PEP 255</strong></a>:\n",
"<em>Simple Generators</em></td>\n",
"</tr>\n",
"<tr><td>division</td>\n",
"<td>2.2.0a2</td>\n",
"<td>3.0</td>\n",
"<td><<a class=\"pep reference external\" href=\"http://www.python.org/dev/peps/pep-0238\"><strong>PEP 238</strong></a>:\n",
"<td><a href=\"http://www.python.org/dev/peps/pep-0238\"><strong>PEP 238</strong></a>:\n",
"<em>Changing the Division Operator</em></td>\n",
"</tr>\n",
"<tr><td>absolute_import</td>\n",
@ -198,7 +198,7 @@
"language": "python",
"metadata": {},
"outputs": [],
"prompt_number": 3
"prompt_number": 1
},
{
"cell_type": "markdown",
@ -227,10 +227,9 @@
"cell_type": "markdown",
"metadata": {},
"source": [
"Very trivial, and the change in the print-syntax is probably the most widely known change, but still it is worth mentioning: Python 2's print function doesn't require the parantheses for invoking the print function (it wouldn't choke on them). \n",
"In contrast, Python 3 would raise a `SyntaxError` if we called the print function the Python 2-way without the parentheses. \n",
"Very trivial, and the change in the print-syntax is probably the most widely known change, but still it is worth mentioning: Python 2's print statement has been replaced by the `print()` function, meaning that we have to wrap the object that we want to print in parantheses. \n",
"\n",
"I think this change in Python 3 makes sense in terms of consistency, since it is the common way in Python to invoke function calls with its parentheses."
"Python 2 doesn't have a problem with additional parantheses, but in contrast, Python 3 would raise a `SyntaxError` if we called the print function the Python 2-way without the parentheses. \n"
]
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@ -324,6 +323,38 @@
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"**Note:**\n",
"\n",
"Printing \"Hello, World\" above via Python 2 looked quite \"normal\". However, if we have multiple objects inside the parantheses, we will create a tuple, since `print` is a \"statement\" in Python 2, not a function call."
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"input": [
"print 'Python', python_version()\n",
"print('a', 'b')\n",
"print 'a', 'b'"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"Python 2.7.6\n",
"('a', 'b')\n",
"a b\n"
]
}
],
"prompt_number": 4
},
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"cell_type": "markdown",
"metadata": {},