--- a
+++ b/logger.py
@@ -0,0 +1,42 @@
+import pandas as pd
+"""
+LOGGER
+"""
+LOG_QUEUE = []
+LOGGING = True
+def log(msg=None,start=True,end_prev=True,new_level=False,end_level=False):
+    if not LOGGING: return
+    tag = ''
+    now = pd.to_datetime('now') - pd.Timedelta(5, unit='h')
+    if end_level: end_log_level()
+    if end_prev and len(LOG_QUEUE) > 0:
+        level = LOG_QUEUE.pop()
+        if len(level) > 0:
+            start_dt = level.pop()
+            tag = '<<'*(len(LOG_QUEUE)) + ' --- '
+            __print_entry(now,tag,'({}s)'.format((now-start_dt).total_seconds()))
+        LOG_QUEUE.append(level)
+    if msg is None: return
+    if start:
+        if len(LOG_QUEUE) == 0: LOG_QUEUE.append([])
+        tag = '>>'*(len(LOG_QUEUE)-1) + ' '
+        LOG_QUEUE[-1].append(now)
+        if new_level: LOG_QUEUE.append([])
+    else: tag = ''
+    __print_entry(now,tag,msg)
+
+def __print_entry(dt,tag,msg):
+    print '({}){}{}'.format(dt,tag,msg)
+
+
+def end_log_level():
+    if len(LOG_QUEUE) == 0: return
+    while len(LOG_QUEUE[-1]) > 0 : log()
+    LOG_QUEUE.pop()
+    log()
+
+def end_log():
+    while len(LOG_QUEUE) > 0 : end_log_level()
+
+def stop_logging():
+    LOGGING = False