diff --git a/completion/available/pip.completion.bash b/completion/available/pip.completion.bash
index 7e48c053..010307d7 100644
--- a/completion/available/pip.completion.bash
+++ b/completion/available/pip.completion.bash
@@ -2,17 +2,32 @@
 # Of course, you should first install the pip, say on Debian:
 # sudo apt-get install python-pip
 # sudo apt-get install python3-pip
-# If the pip package is installed within virtual environments, say, python managed by pyenv,
-# you should first initilization the corresponding environment.
-# So that the pip/pip3 is in system's path.
 
-# For the pyenv-based environment:
-if which pyenv >/dev/null; then
-  if pyenv which pip 2>/dev/null; then
-    eval "$(pip completion --bash)"
-  fi
-else
-  if command -v pip >/dev/null; then
-    eval "$(pip completion --bash)"
+# If the pip package is installed within virtual environments,
+# you should first install pip for the corresponding environment.
+
+# Fix pip completion for running it within/outside of pyenv/virtualenv/venv/conda environment.
+
+_pip_completion_hook() {
+  local _pip
+  # For pip resides within the pyenv/virtualenv/venv/conda environments:
+  if [ -n "$VIRTUAL_ENV" ] && [ -x "$VIRTUAL_ENV/bin/pip" ]; then
+    _pip="$VIRTUAL_ENV/bin/pip"
+  elif [ -n "$CONDA_PREFIX" ] && [ -x "$CONDA_PREFIX/bin/pip" ]; then
+    _pip="$CONDA_PREFIX/bin/pip"
+  # For pip resides outside of a virtual environment:
+  elif [ -x /usr/bin/pip ]; then
+    _pip=/usr/bin/pip
   fi
+  if [ -n "$_pip" ]; then
+    eval "$($_pip completion --bash)"
+  fi  
+}
+
+if ! [[ "$PROMPT_COMMAND" =~ _pip_completion_hook ]]; then
+  PROMPT_COMMAND="_pip_completion_hook;$PROMPT_COMMAND";
 fi
+
+
+
+
diff --git a/completion/available/pip3.completion.bash b/completion/available/pip3.completion.bash
index 599e96e5..26ce4b1d 100644
--- a/completion/available/pip3.completion.bash
+++ b/completion/available/pip3.completion.bash
@@ -2,10 +2,32 @@
 # Of course, you should first install the pip, say on Debian:
 # sudo apt-get install python-pip
 # sudo apt-get install python3-pip
-# If the pip package is installed within virtual environments, say, python managed by pyenv,
-# you should first initilization the corresponding environment.
-# So that the pip/pip3 is in system's path.
-if command -v pip3 >/dev/null; then
-  eval "$(pip3 completion --bash)"
+
+# If the pip package is installed within virtual environments,
+# you should first install pip for the corresponding environment.
+
+# Fix pip completion for running it within/outside of pyenv/virtualenv/venv/conda environment.
+
+_pip_completion_hook() {
+  local _pip
+  # For pip resides within the pyenv/virtualenv/venv/conda environments:
+  if [ -n "$VIRTUAL_ENV" ] && [ -x "$VIRTUAL_ENV/bin/pip3" ]; then
+    _pip="$VIRTUAL_ENV/bin/pip3"
+  elif [ -n "$CONDA_PREFIX" ] && [ -x "$CONDA_PREFIX/bin/pip3" ]; then
+    _pip="$CONDA_PREFIX/bin/pip3"
+  # For pip resides outside of a virtual environment:
+  elif [ -x /usr/bin/pip3 ]; then
+    _pip=/usr/bin/pip3
+  fi
+  if [ -n "$_pip" ]; then
+    eval "$($_pip completion --bash)"
+  fi  
+}
+
+if ! [[ "$PROMPT_COMMAND" =~ _pip_completion_hook ]]; then
+  PROMPT_COMMAND="_pip_completion_hook;$PROMPT_COMMAND";
 fi
 
+
+
+