tutorial: make the tutorial workflow run a little slower

cylc/flow/etc/tutorial/cylc-forecasting-workflow/bin/consolidate-observations

@@ -115,4 +115,5 @@ def main():
 
 
 if __name__ == '__main__':
+    util.sleep()
     main()

cylc/flow/etc/tutorial/cylc-forecasting-workflow/bin/forecast

@@ -242,6 +242,7 @@ def main(forecast_interval, forecast_iterations):
 
 
 if __name__ == '__main__':
+    util.sleep()
     try:
         args = [int(sys.argv[1]), int(sys.argv[2])]
     except IndexError:

cylc/flow/etc/tutorial/cylc-forecasting-workflow/bin/get-observations

@@ -40,6 +40,8 @@ import re
 
 import requests
 
+import util
+
 
 BASE_URL = ('http://datapoint.metoffice.gov.uk/public/data/'
             'val/wxobs/all/json/{site_id}'
@@ -215,5 +217,6 @@ def main(site_id, api_key=None):
 
 
 if __name__ == '__main__':
+    util.sleep()
     main(os.environ['SITE_ID'],
          os.environ.get('API_KEY'))

cylc/flow/etc/tutorial/cylc-forecasting-workflow/bin/get-rainfall

@@ -195,4 +195,5 @@ def main():
 
 
 if __name__ == '__main__':
+    util.sleep(2)  # make the tutorial run a little slower
     main()

cylc/flow/etc/tutorial/cylc-forecasting-workflow/bin/post-process

@@ -101,6 +101,7 @@ def main(site_name, time):
 
 
 if __name__ == '__main__':
+    util.sleep()
     try:
         args = (sys.argv[1].lower(), int(sys.argv[2]))
     except IndexError:

cylc/flow/etc/tutorial/cylc-forecasting-workflow/lib/python/util.py

@@ -21,9 +21,11 @@
 from copy import copy
 from contextlib import suppress
 import math
-import jinja2
+import os
 import sys
+import time
 
+import jinja2
 
 R_0 = 6371.  # Radius of the Earth (km).
 
@@ -301,3 +303,12 @@ def generate_html_map(filename, template_file, data, domain, resolution):
                 lat2=domain['lat2'],
                 data=data
             ))
+
+
+def sleep(secs=4):
+    """Make the tutorials run a little slower so users can follow along.
+
+    (Only if not running in CI).
+    """
+    if 'CI' not in os.environ:
+        time.sleep(secs)

cylc/flow/etc/tutorial/runtime-tutorial/flow.cylc

@@ -1,6 +1,7 @@
 #!jinja2
 [scheduler]
     UTC mode = True
+    allow implicit tasks = True  # TODO: remove at end of exercise
 
 [scheduling]
     # TODO: Set initial cycle point