diff --git a/README.md b/README.md
index 3f625ffd..62281c22 100644
--- a/README.md
+++ b/README.md
@@ -26,8 +26,11 @@ pip install venv
 python3 -m venv pupyvenv
 source pupyvenv/bin/activate
 pip install -r requirements.txt
-
-python3 -m pupy.cli.pupysh
+```
+run pupysh from the dev install :
+```
+source pupyenv/bin/activate
+python3 -m pupy.cli
 ```
 
 ## Description
diff --git a/pupy/pupylib/PupyClient.py b/pupy/pupylib/PupyClient.py
index 5d42c7fb..4dfbf533 100644
--- a/pupy/pupylib/PupyClient.py
+++ b/pupy/pupylib/PupyClient.py
@@ -77,10 +77,7 @@ class PupyClient(object):
         # alias
         self.conn = self.desc['conn']
 
-        self.is3to2 = (
-            self.conn.remote_version[0] == 2 and
-            sys.version_info.major == 3
-        )
+        self.is3to2 = (self.conn.remote_version[0] == 2 and sys.version_info.major == 3)
 
         self.target = dependencies.Target(
             self.conn.remote_version,
diff --git a/pupy/pupylib/PupyClientInitializer.py b/pupy/pupylib/PupyClientInitializer.py
index bc336288..46622abd 100644
--- a/pupy/pupylib/PupyClientInitializer.py
+++ b/pupy/pupylib/PupyClientInitializer.py
@@ -10,12 +10,10 @@ import getpass
 import uuid
 import sys
 import os
-import locale
 import logging
 import socket
 import pupy.agent as pupy
 
-import encodings
 
 
 def _as_unicode(x):
@@ -448,12 +446,12 @@ def get_uuid():
 
     try:
         uacLevel = getUACLevel()
-    except Exception as e:
+    except Exception:
         uacLevel = "?"
 
     try:
         integrity_level = get_integrity_level()
-    except Exception as e:
+    except Exception:
         integrity_level = "?"
 
     try:
diff --git a/pupy/pupylib/PupyCmd.py b/pupy/pupylib/PupyCmd.py
index 43ee195e..79006625 100644
--- a/pupy/pupylib/PupyCmd.py
+++ b/pupy/pupylib/PupyCmd.py
@@ -59,7 +59,7 @@ from .PupyModule import (
 from .PupyCompleter import CompletionContext
 from .PupyVersion import BANNER, UPSTREAM, DISCLAIMER
 from .PupyOutput import (
-    Text, Line, Color, Title, NewLine, Info,
+    Line, Color, Title, NewLine, Info,
     ServiceInfo, Warn, Error, Success,  Indent
 )
 
@@ -538,7 +538,7 @@ class PupyCmd(cmd.Cmd):
         if cmd is None:
             return self.default(line)
         self.lastcmd = line
-        if line == 'EOF' :
+        if line == 'EOF':
             self.lastcmd = ''
         if cmd == '':
             return self.default(line)
diff --git a/pupy/pupylib/PupyCompleter.py b/pupy/pupylib/PupyCompleter.py
index d894afeb..a0702e96 100644
--- a/pupy/pupylib/PupyCompleter.py
+++ b/pupy/pupylib/PupyCompleter.py
@@ -166,9 +166,7 @@ def module_name_completer(module, args, text, context):
         clients_filter=context.handler.default_filter)
     )
 
-    return [
-        module for module in modules if module.startswith(text) or not(text)
-    ]
+    return [module for module in modules if module.startswith(text) or not text]
 
 
 def module_args_completer(module, args, text, context):
diff --git a/pupy/pupylib/PupyServer.py b/pupy/pupylib/PupyServer.py
index 2daedc4d..da57e1f2 100644
--- a/pupy/pupylib/PupyServer.py
+++ b/pupy/pupylib/PupyServer.py
@@ -47,6 +47,7 @@ if sys.version_info.major > 2:
     from itertools import filterfalse
 
     basestring = str
+    long = int
 
 else:
     from itertools import ifilterfalse as filterfalse
diff --git a/pupy/pupylib/PupyWeb.py b/pupy/pupylib/PupyWeb.py
index c7e744fc..d9f00fcb 100644
--- a/pupy/pupylib/PupyWeb.py
+++ b/pupy/pupylib/PupyWeb.py
@@ -304,26 +304,14 @@ class PupyWebServer(object):
 
     def get_random_path_at_webroot(self):
         while True:
-            filename = ''.join(
-                random.choice(
-                    string.ascii_uppercase +
-                    string.ascii_lowercase +
-                    string.digits
-                ) for _ in xrange(10)
-            )
+            filename = ''.join(random.choice(string.ascii_uppercase + string.ascii_lowercase + string.digits) for _ in xrange(10))
 
             filepath = path.join(self.root, filename)
             if not path.isfile(filepath):
                 return filepath, filename
 
     def random_path(self):
-        return '/' + ''.join(
-            random.choice(
-                string.ascii_uppercase +
-                string.ascii_lowercase +
-                string.digits
-            ) for _ in xrange(10)
-        )
+        return '/' + ''.join(random.choice(string.ascii_uppercase + string.ascii_lowercase + string.digits) for _ in xrange(10))
 
     def register_mapping(self, name):
         name = self.random_path()
diff --git a/pupy/pupylib/__init__.py b/pupy/pupylib/__init__.py
index 0c9f3ed4..3f639fe0 100644
--- a/pupy/pupylib/__init__.py
+++ b/pupy/pupylib/__init__.py
@@ -11,7 +11,6 @@ __all__ = [
 import os
 import sys
 import platform
-import re
 
 ROOT = os.path.abspath(os.path.join(os.path.dirname(__file__), '..'))
 HOST_SYSTEM = platform.system()
@@ -49,4 +48,3 @@ if not getattr(sys, '__from_build_library_zip_compiler__', False):
         from .PupyModule import PupyModule
         from .PupyClient import PupyClient
         from .PupyServer import PupyServer
-
diff --git a/pupy/pupylib/payloads/dependencies.py b/pupy/pupylib/payloads/dependencies.py
index e108450c..d7d9a210 100644
--- a/pupy/pupylib/payloads/dependencies.py
+++ b/pupy/pupylib/payloads/dependencies.py
@@ -359,8 +359,7 @@ def get_py_encoding(content):
         return
 
     line = lines[0]
-    if not (line.startswith(b'#') and
-            b'coding:' in line):
+    if not (line.startswith(b'#') and b'coding:' in line):
         return
 
     idx = line.find(b'coding:') + 7
@@ -845,13 +844,13 @@ def add_missing_init(target, modules):
             f=pathname+"/__init__.pyo"
             if f not in modules and f not in toadd and f[:-1] not in modules:
                 logger.debug("adding missing {}".format(f))
-                toadd[f] = pupycompile("", pathname , target=target.pyver)
+                toadd[f] = pupycompile("", pathname, target=target.pyver)
     modules.update(toadd)
 
 def bundle(target):
     if not target.os or not target.arch:
         return None
-    
+
     bundle_name = '{}-{}-{}{}.zip'.format(
         target.os, target.arch, target.pymaj, target.pymin
     )
diff --git a/pupy/pupylib/utils/credentials.py b/pupy/pupylib/utils/credentials.py
index afec3228..48ebb50e 100644
--- a/pupy/pupylib/utils/credentials.py
+++ b/pupy/pupylib/utils/credentials.py
@@ -5,7 +5,6 @@ from __future__ import print_function
 
 import os
 import json
-import codecs
 
 from pupy.network.lib.convcompat import (
     ExtendedJsonEncoder, ExtendedJsonDecoder,
diff --git a/pupy/pupylib/utils/downloader.py b/pupy/pupylib/utils/downloader.py
new file mode 100644
index 00000000..4a2a98ab
--- /dev/null
+++ b/pupy/pupylib/utils/downloader.py
@@ -0,0 +1,16 @@
+#!/usr/bin/env python
+# -*- coding: UTF8 -*-
+
+import requests
+import shutil
+import os
+from tqdm.auto import tqdm
+# make an HTTP request within a context manager
+with requests.get("https://www.example.com/file.txt", stream=True) as r:
+    # check header to get content length, in bytes
+    total_length = int(r.headers.get("Content-Length"))
+    # implement progress bar via tqdm
+    with tqdm.wrapattr(r.raw, "read", total=total_length, desc="")as raw:
+        # save the output to a file
+        with open(f"{os.path.basename(r.url)}", 'wb')as output:
+            shutil.copyfileobj(raw, output)
diff --git a/pupy/pupylib/utils/term.py b/pupy/pupylib/utils/term.py
index 7f7730ac..abdd1815 100644
--- a/pupy/pupylib/utils/term.py
+++ b/pupy/pupylib/utils/term.py
@@ -13,7 +13,6 @@ import struct
 import platform
 import re
 import locale
-import codecs
 
 import fcntl
 import termios
@@ -660,10 +659,7 @@ def as_term_bytes(text, width=0):
         for line in hexdump.dumpgen(content):
             if text.colorize:
                 # Change to something HexdumpLexer knows
-                lines.append(
-                    line[:8] + ' ' + line[9:60] + '|' +
-                    line[60:] + '|'
-                )
+                lines.append(line[:8] + ' ' + line[9:60] + '|' + line[60:] + '|')
             else:
                 lines.append(line)
 
diff --git a/tox.ini b/tox.ini
new file mode 100644
index 00000000..f55c1e06
--- /dev/null
+++ b/tox.ini
@@ -0,0 +1,56 @@
+[flake8]
+# This style things should be fixed with time.
+# They should be ungnored one-by-one and fixed.
+
+# E722 -- Should be fixed somehow
+
+# W606 - Rpyc (at least old) incompatible with Python3.7
+
+# !!! DO NOT ADD ANY NEW EXCEPTION HERE !!!
+
+ignore = E722,
+       E501,E402,
+       E241,E221,E211,E222,E225,E226,E227,E272,E231,
+       E251,E265,E302,E225,E305,E303,
+       E228,E127,E128,E129,E502,E271,E261,E261,E262,
+       E122,E123,E124,E125,E126,E131,E121,E226,E266,E242,
+       E731,W606
+       
+
+per-file-ignores =
+	# X509 standard names are short
+	pupylib/PupyCredentials.py: E741
+
+	# FIXME: add proper __all__ statement
+	packages/windows/all/pupwinutils/hookfuncs.py: F401
+	network/lib/__init__.py: F401
+	network/lib/transports/cryptoutils/pyaes/__init__.py: F401
+
+	# Large stolen file
+	packages/windows/all/wmi.py: E111
+
+	# Legacy formatting
+	network/lib/transports/cryptoutils/pyaes/aes.py: E201,E202,E222,W504
+
+	# False positive
+	packages/all/fsutils.py: F811
+
+exclude =
+	conf
+	crypto
+	data
+	external
+	library_patches
+	output
+	payload_templates
+	proxy
+	webstatic
+	packages/patches
+	# deprecated
+	network/lib/streams/PupyAsyncStream.py
+	# symlinks (travis workaround)
+	packages/linux/all/lazagne
+	packages/linux/all/mimipy.py
+	packages/linux/all/beroot
+	packages/windows/all/beroot
+	packages/windows/all/lazagne