Barebones Heroku app

.env

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+FLASK_APP=tictactoe.py

Pipfile

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+[[source]]
+url = "https://pypi.python.org/simple"
+verify_ssl = true
+name = "pypi"
+
+[packages]
+flask = "*"
+
+[dev-packages]
+
+[requires]
+python_version = "3.6"

Pipfile.lock

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+{
+    "_meta": {
+        "hash": {
+            "sha256": "cbf8e638e8cd1a98e1008cd9f9ead22772a784d607fbc4e41b89de5b19011179"
+        },
+        "host-environment-markers": {
+            "implementation_name": "cpython",
+            "implementation_version": "3.6.2",
+            "os_name": "posix",
+            "platform_machine": "x86_64",
+            "platform_python_implementation": "CPython",
+            "platform_release": "17.0.0",
+            "platform_system": "Darwin",
+            "platform_version": "Darwin Kernel Version 17.0.0: Thu Aug 24 21:48:19 PDT 2017; root:xnu-4570.1.46~2/RELEASE_X86_64",
+            "python_full_version": "3.6.2",
+            "python_version": "3.6",
+            "sys_platform": "darwin"
+        },
+        "pipfile-spec": 6,
+        "requires": {
+            "python_version": "3.6"
+        },
+        "sources": [
+            {
+                "name": "pypi",
+                "url": "https://pypi.python.org/simple",
+                "verify_ssl": true
+            }
+        ]
+    },
+    "default": {
+        "click": {
+            "hashes": [
+                "sha256:29f99fc6125fbc931b758dc053b3114e55c77a6e4c6c3a2674a2dc986016381d",
+                "sha256:f15516df478d5a56180fbf80e68f206010e6d160fc39fa508b65e035fd75130b"
+            ],
+            "version": "==6.7"
+        },
+        "flask": {
+            "hashes": [
+                "sha256:0749df235e3ff61ac108f69ac178c9770caeaccad2509cb762ce1f65570a8856",
+                "sha256:49f44461237b69ecd901cc7ce66feea0319b9158743dd27a2899962ab214dac1"
+            ],
+            "version": "==0.12.2"
+        },
+        "itsdangerous": {
+            "hashes": [
+                "sha256:cbb3fcf8d3e33df861709ecaf89d9e6629cff0a217bc2848f1b41cd30d360519"
+            ],
+            "version": "==0.24"
+        },
+        "jinja2": {
+            "hashes": [
+                "sha256:2231bace0dfd8d2bf1e5d7e41239c06c9e0ded46e70cc1094a0aa64b0afeb054",
+                "sha256:ddaa01a212cd6d641401cb01b605f4a4d9f37bfc93043d7f760ec70fb99ff9ff"
+            ],
+            "version": "==2.9.6"
+        },
+        "markupsafe": {
+            "hashes": [
+                "sha256:a6be69091dac236ea9c6bc7d012beab42010fa914c459791d627dad4910eb665"
+            ],
+            "version": "==1.0"
+        },
+        "werkzeug": {
+            "hashes": [
+                "sha256:e8549c143af3ce6559699a01e26fa4174f4c591dbee0a499f3cd4c3781cdec3d",
+                "sha256:903a7b87b74635244548b30d30db4c8947fe64c5198f58899ddcd3a13c23bb26"
+            ],
+            "version": "==0.12.2"
+        }
+    },
+    "develop": {}
+}

Procfile

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+web: python3 -m flask run

tictactoe.py

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+from flask import Flask
+
+app = Flask(__name__)
+
+@app.route('/')
+def hello():
+    return 'Hello!'