Concatenation

example.py

import timeit
import string


SAMPLE = """
[
  {
    "url": "https://api.github.com/repos/octocat/Hello-World/releases/1",
    "html_url": "https://github.com/octocat/Hello-World/releases/v1.0.0",
    "assets_url": "https://api.github.com/repos/octocat/Hello-World/releases/1/assets",
    "upload_url": "https://uploads.github.com/repos/octocat/Hello-World/releases/1/assets{?name,label}",
    "tarball_url": "https://api.github.com/repos/octocat/Hello-World/tarball/v1.0.0",
    "zipball_url": "https://api.github.com/repos/octocat/Hello-World/zipball/v1.0.0",
    "id": 1,
    "node_id": "MDc6UmVsZWFzZTE=",
    "tag_name": "v1.0.0",
    "target_commitish": "master",
    "name": "v1.0.0",
    "body": "Description of the release",
    "draft": false,
    "prerelease": false,
    "created_at": "2013-02-27T19:35:32Z",
    "published_at": "2013-02-27T19:35:32Z",
    "author": {
      "login": "octocat",
      "id": 1,
      "node_id": "MDQ6VXNlcjE=",
      "avatar_url": "https://github.com/images/error/octocat_happy.gif",
      "gravatar_id": "",
      "url": "https://api.github.com/users/octocat",
      "html_url": "https://github.com/octocat",
      "followers_url": "https://api.github.com/users/octocat/followers",
      "following_url": "https://api.github.com/users/octocat/following{/other_user}",
      "gists_url": "https://api.github.com/users/octocat/gists{/gist_id}",
      "starred_url": "https://api.github.com/users/octocat/starred{/owner}{/repo}",
      "subscriptions_url": "https://api.github.com/users/octocat/subscriptions",
      "organizations_url": "https://api.github.com/users/octocat/orgs",
      "repos_url": "https://api.github.com/users/octocat/repos",
      "events_url": "https://api.github.com/users/octocat/events{/privacy}",
      "received_events_url": "https://api.github.com/users/octocat/received_events",
      "type": "User",
      "site_admin": false
    },
    "assets": [
      {
        "url": "https://api.github.com/repos/octocat/Hello-World/releases/assets/1",
        "browser_download_url": "https://github.com/octocat/Hello-World/releases/download/v1.0.0/example.zip",
        "id": 1,
        "node_id": "MDEyOlJlbGVhc2VBc3NldDE=",
        "name": "example.zip",
        "label": "short description",
        "state": "uploaded",
        "content_type": "application/zip",
        "size": 1024,
        "download_count": 42,
        "created_at": "2013-02-27T19:35:32Z",
        "updated_at": "2013-02-27T19:35:32Z",
        "uploader": {
          "login": "octocat",
          "id": 1,
          "node_id": "MDQ6VXNlcjE=",
          "avatar_url": "https://github.com/images/error/octocat_happy.gif",
          "gravatar_id": "",
          "url": "https://api.github.com/users/octocat",
          "html_url": "https://github.com/octocat",
          "followers_url": "https://api.github.com/users/octocat/followers",
          "following_url": "https://api.github.com/users/octocat/following{/other_user}",
          "gists_url": "https://api.github.com/users/octocat/gists{/gist_id}",
          "starred_url": "https://api.github.com/users/octocat/starred{/owner}{/repo}",
          "subscriptions_url": "https://api.github.com/users/octocat/subscriptions",
          "organizations_url": "https://api.github.com/users/octocat/orgs",
          "repos_url": "https://api.github.com/users/octocat/repos",
          "events_url": "https://api.github.com/users/octocat/events{/privacy}",
          "received_events_url": "https://api.github.com/users/octocat/received_events",
          "type": "User",
          "site_admin": false
        }
      }
    ]
  }
]
"""
SAMPLE_CHUNKS = SAMPLE.split(",")
LETTERS_CHUNKS = list(string.printable)


def concat_with_plus():
    result = ""
    for chunk in SAMPLE_CHUNKS:
        result += chunk.upper()
    return result


def concat_with_join_list_comprehension():
    # new list is intentional here, because usually we collect data in a
    # new array
    return "".join([el.upper() for el in SAMPLE_CHUNKS])


def concat_with_join_loop():
    lst = []
    for chunk in SAMPLE_CHUNKS:
        lst.append(chunk.upper())
    return "".join(lst)


def concat_with_plus_small():
    hostname = "github.com"
    username = "9seconds"
    return "https://" + hostname + "/" + username


def concat_with_join():
    hostname = "github.com"
    username = "9seconds"
    return "".join(["https://", hostname, "/", username])


def concat_with_plus_letters():
    result = ""
    for chunk in LETTERS_CHUNKS:
        result += chunk.upper()
    return result


def concat_with_join_letters():
    lst = []
    for chunk in LETTERS_CHUNKS:
        lst.append(chunk.upper())
    return "".join(lst)


timers = {
    func: timeit.Timer(
        "main()", f"from __main__ import {func.__name__} as main"
    )
    for func in (
        concat_with_plus,
        concat_with_join,
        concat_with_join_loop,
        concat_with_plus_small,
        concat_with_join_letters,
        concat_with_plus_letters,
    )
}

for func, tme in timers.items():
    print(f"{func.__name__}: {tme.timeit()}")

gistfile1.txt

concat_with_plus: 8.804481650004163
concat_with_join: 0.1536320090526715
concat_with_join_loop: 5.991983758984134
concat_with_plus_small: 0.16146991704590619
concat_with_join_letters: 5.990820250008255
concat_with_plus_letters: 6.699613924021833