Added an example using FastAPI (#571)

Co-authored-by: Bruno Rocha <rochacbruno@users.noreply.github.com>

example/fastapi_with_ini/app.py

@@ -0,0 +1,36 @@
+from dynaconf import Dynaconf
+from typing import Optional
+from fastapi import FastAPI
+
+settings = Dynaconf(
+    settings_file="config.toml",  # location of config file
+    environments=["ansible", "puppet"],  # available modes/environments
+    envvar_prefix="TEFLO",  # prefix for exporting env vars
+    env_switcher="TEFLO_MODE",  # Variable that controls mode switch
+    env="ANSIBLE",  # Initial env/mode
+)
+
+app = FastAPI()
+
+@app.get("/settings")
+def read_root():
+    return settings
+
+@app.get("/settings/{setting_name}")
+def read_item(setting_name: str):
+    return {setting_name: settings.setting_name}
+
+if settings.current_env == "ANSIBLE":  # this is the initial default
+    assert settings.data_folder == "ansible/.teflo"
+
+if settings.current_env == "PUPPET":  # only when TEFLO_MODE=puppet
+    assert settings.data_folder == "puppet/.teflo"
+
+assert settings.log_level == "info"  # might be exported TEFLO_DEBUG_MODE
+
+assert settings.workspace == "."
+
+print(settings.data_folder)
+print(settings["log_remove"])
+print(settings.get("verbosity"))
+print(settings.LOG_LEVEL)

example/fastapi_with_ini/config.toml

@@ -0,0 +1,14 @@
+[default]
+log_level = "info"
+workspace= "."
+data_folder= ".teflo"
+
+[ansible]
+data_folder = "ansible/.teflo"
+log_remove = true
+verbosity = "v"
+
+[puppet]
+data_folder = "puppet/.teflo"
+log_remove = false
+verbosity = "vvv"