feat(python): change order of navigation in comprehension snippets (#485

)

This change is motivated by getting better completions when using a
language server. When starting from the `iterable` part of the snippet,
the language server can infer the type of the values contained in the
iterable, so that when we get to the part of writing the `value` it can
offer autocompletion and suggestions for fields and methods of `value`.

snippets/python/comprehension.json

@@ -1,47 +1,47 @@
 {
     "List comprehension": {
         "prefix": "lc",
-        "body": "[${1:value} for ${2:value} in ${3:iterable}]$0",
+        "body": "[${3:value} for ${2:value} in ${1:iterable}]$0",
         "description": "List comprehension for creating a list based on existing lists."
     },
     "List comprehension if else": {
         "prefix": "lcie",
-        "body": "[${1:value} if ${2:condition} else ${3:condition} for ${4:value} in ${5:iterable}]$0",
+        "body": "[${3:value} if ${4:condition} else ${5:condition} for ${2:value} in ${1:iterable}]$0",
         "description": "List comprehension for creating a list based on existing lists, with conditional if-else statement."
     },
     "List comprehension if filter": {
         "prefix": "lci",
-        "body": "[${1:value} for ${2:value} in ${3:iterable} if ${4:condition}$0]",
+        "body": "[${3:value} for ${2:value} in ${1:iterable} if ${4:condition}$0]",
         "description": "List comprehension for creating a list based on existing lists, with conditional if statement."
     },
     "Dictionary comprehension": {
         "prefix": "dc",
-        "body": "{${1:key}: ${2:value} for ${3:key}, ${4:value} in ${5:iterable}}$0",
+        "body": "{${4:key}: ${5:value} for ${2:key}, ${3:value} in ${1:iterable}}$0",
         "description": "Handy and faster way to create dictionaries based on existing dictionaries."
     },
     "Dictionary comprehension if filter": {
         "prefix": "dci",
-        "body": "{${1:key}: ${2:value} for ${3:key}, ${4:value} in ${5:iterable} if ${6:condition}}$0",
+        "body": "{${4:key}: ${5:value} for ${2:key}, ${3:value} in ${1:iterable} if ${6:condition}}$0",
         "description": "Handy and faster way to create dictionaries based on existing dictionaries, with conditional if statement."
     },
     "Set comprehension": {
         "prefix": "sc",
-        "body": "{${1:value} for ${2:value} in ${3:iterable}}$0",
+        "body": "{${3:value} for ${2:value} in ${1:iterable}}$0",
         "description": "Create a set based on existing iterables."
     },
     "Set Comprehension if filter": {
         "prefix": "sci",
-        "body": "{${1:value} for ${2:value} in ${3:iterable} if ${4:condition}}$0",
+        "body": "{${3:value} for ${2:value} in ${1:iterable} if ${4:condition}}$0",
         "description": "Create a set based on existing iterables, with condition if statement."
     },
     "Generator comprehension": {
         "prefix": "gc",
-        "body": "(${1:key} for ${2:value} in ${3:iterable})$0",
+        "body": "(${3:key} for ${2:value} in ${1:iterable})$0",
         "description": "Create a generator based on existing iterables."
     },
     "Generator comprehension if filter": {
         "prefix": "gci",
-        "body": "(${1:key} for ${2:value} in ${3:iterable} if ${4:condition})$0",
+        "body": "(${3:key} for ${2:value} in ${1:iterable} if ${4:condition})$0",
         "description": "Create a generator based on existing iterables, with condition if statement."
     }
 }