Python: Add basic snippets for Python

[petetronic]

RStudio included a small set of useful snippets when writing Python scripts. We should review those snippets and select the set that we think will be useful for Positron users.

[petetronic]

The raw set from RStudio to review is:

{
  "#!": {
    "prefix": "#!",
    "body": "#!/usr/bin/env python"
  },
  "imp": {
    "prefix": "imp",
    "body": "import ${1:module}"
  },
  "from": {
    "prefix": "from",
    "body": [
      "from ${1:package} import ${2:module}",
      "# Module Docstring"
    ]
  },
  "docs": {
    "prefix": "docs",
    "body": [
      "'''",
      "File: ${1:FILENAME:file_name}",
      "Author: ${2:author}",
      "Description: ${3}",
      "'''"
    ]
  },
  "wh": {
    "prefix": "wh",
    "body": [
      "while ${1:condition}:",
      "\t${2:# TODO: write code...}",
      "# dowh - does the same as do...while in other languages"
    ]
  },
  "dowh": {
    "prefix": "dowh",
    "body": [
      "while True:",
      "\t${1:# TODO: write code...}",
      "\tif ${2:condition}:",
      "\t\tbreak"
    ]
  },
  "with": {
    "prefix": "with",
    "body": [
      "with ${1:expr} as ${2:var}:",
      "\t${3:# TODO: write code...}",
      "# New Class"
    ]
  },
  "cl": {
    "prefix": "cl",
    "body": [
      "class ${1:ClassName}(${2:object}):",
      "\t\"\"\"${3:docstring for $1}\"\"\"",
      "\tdef __init__(self, ${4:arg}):",
      "\t\t${5:super($1, self).__init__()}",
      "\t\tself.$4 = $4",
      "\t\t${6}",
      "# New Function"
    ]
  },
  "def": {
    "prefix": "def",
    "body": [
      "def ${1:fname}(${2:`indent('.') ? 'self' : ''`}):",
      "\t\"\"\"${3:docstring for $1}\"\"\"",
      "\t${4:# TODO: write code...}"
    ]
  },
  "deff": {
    "prefix": "deff",
    "body": [
      "def ${1:fname}(${2:`indent('.') ? 'self' : ''`}):",
      "\t${3:# TODO: write code...}",
      "# New Method"
    ]
  },
  "defs": {
    "prefix": "defs",
    "body": [
      "def ${1:mname}(self, ${2:arg}):",
      "\t${3:# TODO: write code...}",
      "# New Property"
    ]
  },
  "property": {
    "prefix": "property",
    "body": [
      "def ${1:foo}():",
      "\tdoc = \"${2:The $1 property.}\"",
      "\tdef fget(self):",
      "\t\t${3:return self._$1}",
      "\tdef fset(self, value):",
      "\t\t${4:self._$1 = value}",
      "# Ifs"
    ]
  },
  "if": {
    "prefix": "if",
    "body": [
      "if ${1:condition}:",
      "\t${2:# TODO: write code...}"
    ]
  },
  "el": {
    "prefix": "el",
    "body": [
      "else:",
      "\t${1:# TODO: write code...}"
    ]
  },
  "ei": {
    "prefix": "ei",
    "body": [
      "elif ${1:condition}:",
      "\t${2:# TODO: write code...}",
      "# For"
    ]
  },
  "for": {
    "prefix": "for",
    "body": [
      "for ${1:item} in ${2:items}:",
      "\t${3:# TODO: write code...}",
      "# Encodes"
    ]
  },
  "cutf8": {
    "prefix": "cutf8",
    "body": "# -*- coding: utf-8 -*-"
  },
  "clatin1": {
    "prefix": "clatin1",
    "body": "# -*- coding: latin-1 -*-"
  },
  "cascii": {
    "prefix": "cascii",
    "body": [
      "# -*- coding: ascii -*-",
      "# Lambda"
    ]
  },
  "ld": {
    "prefix": "ld",
    "body": "${1:var} = lambda ${2:vars} : ${3:action}"
  },
  ".": {
    "prefix": ".",
    "body": "self."
  },
  "try": {
    "prefix": "try",
    "body": [
      "try:",
      "\t${1:# TODO: write code...}",
      "except ${2:Exception}, ${3:e}:",
      "\t${4:raise $3}"
    ]
  },
  "try.1": {
    "prefix": "try",
    "body": [
      "try:",
      "\t${1:# TODO: write code...}",
      "except ${2:Exception}, ${3:e}:",
      "\t${4:raise $3}",
      "else:",
      "\t${5:# TODO: write code...}"
    ]
  },
  "try.2": {
    "prefix": "try",
    "body": [
      "try:",
      "\t${1:# TODO: write code...}",
      "except ${2:Exception}, ${3:e}:",
      "\t${4:raise $3}",
      "finally:",
      "\t${5:# TODO: write code...}"
    ]
  },
  "try.3": {
    "prefix": "try",
    "body": [
      "try:",
      "\t${1:# TODO: write code...}",
      "except ${2:Exception}, ${3:e}:",
      "\t${4:raise $3}",
      "else:",
      "\t${5:# TODO: write code...}",
      "finally:",
      "\t${6:# TODO: write code...}",
      "# if __name__ == '__main__':"
    ]
  },
  "ifmain": {
    "prefix": "ifmain",
    "body": [
      "if __name__ == '__main__':",
      "\t${1:main()}",
      "# __magic__"
    ]
  },
  "_": {
    "prefix": "_",
    "body": [
      "__${1:init}__${2}",
      "# python debugger (pdb)"
    ]
  },
  "pdb": {
    "prefix": "pdb",
    "body": [
      "import pdb; pdb.set_trace()",
      "# ipython debugger (ipdb)"
    ]
  },
  "ipdb": {
    "prefix": "ipdb",
    "body": [
      "import ipdb; ipdb.set_trace()",
      "# ipython debugger (pdbbb)"
    ]
  },
  "pdbbb": {
    "prefix": "pdbbb",
    "body": "import pdbpp; pdbpp.set_trace()"
  },
  "pprint": {
    "prefix": "pprint",
    "body": "import pprint; pprint.pprint(${1})${2}"
  },
  "\"": {
    "prefix": "\"",
    "body": [
      "\"\"\"",
      "${1:doc}",
      "\"\"\"",
      "# test function/method"
    ]
  },
  "test": {
    "prefix": "test",
    "body": [
      "def test_${1:description}(${2:self}):",
      "\t${3:# TODO: write code...}",
      "# test case"
    ]
  },
  "testcase": {
    "prefix": "testcase",
    "body": [
      "class ${1:ExampleCase}(unittest.TestCase):",
      "\t",
      "\tdef test_${2:description}(self):",
      "\t\t${3:# TODO: write code...}"
    ]
  },
  "fut": {
    "prefix": "fut",
    "body": [
      "from __future__ import ${1}",
      "#getopt"
    ]
  },
  "getopt": {
    "prefix": "getopt",
    "body": [
      "try:",
      "\t# Short option syntax: \"hv:\"",
      "\t# Long option syntax: \"help\" or \"verbose=\"",
      "\topts, args = getopt.getopt(sys.argv[1:], \"${1:short_options}\", [${2:long_options}])",
      "",
      "except getopt.GetoptError, err:",
      "\t# Print debug info",
      "\tprint str(err)",
      "\t${3:error_action}",
      "",
      "for option, argument in opts:",
      "\tif option in (\"-h\", \"--help\"):",
      "\t\t${4}",
      "\telif option in (\"-v\", \"--verbose\"):",
      "\t\tverbose = argument"
    ]
  }
}

[petetronic]

Currently, #! won't suggest completions as it is in a comment.

[jthomasmock]

There are some from an extension as well, but they're probably not that interesting for DataSci: https://github.com/cstrap/python-snippets/tree/master/snippets

[jthomasmock]

x-posting the equivalent request for R: #1438

[kevinushey]

IIRC the snippets from RStudio were just the default Python snippets we inherited from Ace. IMHO we should start over and choose only the snippets we think will be universally relevant / helpful.