Standard output misbehaviour (need to flush) #1376

4 files changed, 17 insertions, 4 deletions

diff --git a/NEWS b/NEWS
index 26a2ddb6..e891c944 100644
--- a/NEWS
+++ b/NEWS
@@ -24,6 +24,7 @@ Bugs corrected:
     * Support for monochrome (serial) terminals e.g. vt220 #1362
     * TypeError on opening (Wifi plugin) #1373
     * Some field name are incorrect in CSV export #1372
+    * Standard output misbehaviour (need to flush) #1376 
 
 Others:
 
diff --git a/glances/compat.py b/glances/compat.py
index 3563810a..2aaf099e 100644
--- a/glances/compat.py
+++ b/glances/compat.py
@@ -21,6 +21,7 @@
 # pylint: skip-file
 """Python 2/3 compatibility shims."""
 
+from __future__ import print_function
 import operator
 import sys
 import unicodedata
@@ -54,6 +55,10 @@ if PY3:
     viewvalues = operator.methodcaller('values')
     viewitems = operator.methodcaller('items')
 
+    def printandflush(string):
+        """Print and flush (used by stdout* outputs modules)"""
+        print(string, flush=True)
+
     def to_ascii(s):
         """Convert the bytes string to a ASCII string
         Usefull to remove accent (diacritics)"""
@@ -126,6 +131,11 @@ else:
     viewvalues = operator.methodcaller('viewvalues')
     viewitems = operator.methodcaller('viewitems')
 
+    def printandflush(string):
+        """Print and flush (used by stdout* outputs modules)"""
+        print(string)
+        sys.stdout.flush()
+
     def mean(numbers):
         return float(sum(numbers)) / max(len(numbers), 1)
 
diff --git a/glances/outputs/glances_stdout.py b/glances/outputs/glances_stdout.py
index a3c70cc5..065495e2 100644
--- a/glances/outputs/glances_stdout.py
+++ b/glances/outputs/glances_stdout.py
@@ -22,6 +22,7 @@
 import time
 
 from glances.logger import logger
+from glances.compat import printandflush
 
 
 class GlancesStdout(object):
@@ -70,13 +71,13 @@ class GlancesStdout(object):
             if attribute is not None:
                 # With attribute
                 try:
-                    print("{}.{}: {}".format(plugin, attribute,
-                                             stat[attribute]))
+                    printandflush("{}.{}: {}".format(plugin, attribute,
+                                                     stat[attribute]))
                 except KeyError as err:
                     logger.error("Can not display stat {}.{} ({})".format(plugin, attribute, err))
             else:
                 # Without attribute
-                print("{}: {}".format(plugin, stat))
+                printandflush("{}: {}".format(plugin, stat))
 
         # Wait until next refresh
         if duration > 0:
diff --git a/glances/outputs/glances_stdout_csv.py b/glances/outputs/glances_stdout_csv.py
index 8280c5f3..06775140 100644
--- a/glances/outputs/glances_stdout_csv.py
+++ b/glances/outputs/glances_stdout_csv.py
@@ -22,6 +22,7 @@
 import time
 
 from glances.logger import logger
+from glances.compat import printandflush
 
 
 class GlancesStdoutCsv(object):
@@ -128,7 +129,7 @@ class GlancesStdoutCsv(object):
                 line += self.build_data(plugin, attribute, stat)
 
         # Display the line (without the last 'separator')
-        print(line[:-1])
+        printandflush(line[:-1])
 
         # Display header one time
         self.header = False