Added flake8 checks

Author: sergioteula

.flake8

@@ -0,0 +1,4 @@
+[flake8]
+max-line-length = 88
+extend-ignore = W503,E203,F401
+exclude = */sdk/*

.githooks/pre-push

@@ -5,5 +5,6 @@ source "${ROOT_DIR}/scripts/helpers"
 
 ./scripts/check_isort
 ./scripts/check_black
+./scripts/check_flake8
 
 header "Proceeding with push"

.github/workflows/lint-and-test.yml

@@ -28,3 +28,15 @@ jobs:
       uses: actions/checkout@v2
     - name: Check code format
       run: ./scripts/check_black
+
+  flake8:
+    runs-on: ubuntu-latest
+    container:
+      image: sergioteula/pytools
+      volumes:
+        - ${{github.workspace}}:/code
+    steps:
+    - name: Check out code
+      uses: actions/checkout@v2
+    - name: Check code errors
+      run: ./scripts/check_flake8

scripts/check_flake8

@@ -0,0 +1,23 @@
+#! /bin/bash
+
+ROOT_DIR="$(git rev-parse --show-toplevel)"
+source "${ROOT_DIR}/scripts/helpers"
+
+header "Checking code errors with flake8"
+
+if [ -n "$(check_if_installed docker)" ]; then
+    docker run -v "${PWD}:/code" sergioteula/pytools flake8 --color always .
+elif [ -n "$(check_if_installed flake8)" ]; then
+    flake8 --color always .
+else
+    error "flake8 is not installed"
+    exit 1
+fi
+
+EXIT_CODE="$?"
+if [ "$EXIT_CODE" = "0" ]; then
+    success "Code analysis with flake8 is correct"
+else
+    error "There are errors detected by flake8"
+    exit 1
+fi