Issues when installing mythril via requirements.txt: py-ecc, rlp, blake2b, syntax warning

Description

When installing mythril via requirements.txt, two version mismatches and a missing dependency occur, as well as a syntax warning when starting mythril the first time.

Suggestion:

• Add blake2b-py to requirements.txt

Question: How serious are the version mismatches

• py-evm 0.5.0a1 has requirement py-ecc<5.0.0,>=1.4.7, but you'll have py-ecc 5.2.0
• py-evm 0.5.0a1 has requirement rlp<3,>=2, but you'll have rlp 1.2.0

How to Reproduce

$ git clone  https://github.com/ConsenSys/mythril.git
$ cd mythril
$ python3 -m venv venv
$ . venv/bin/activate
$ pip install -r requirements.txt
[...]
ERROR: py-evm 0.5.0a1 has requirement py-ecc<5.0.0,>=1.4.7, but you'll have py-ecc 5.2.0 which is incompatible.
ERROR: py-evm 0.5.0a1 has requirement rlp<3,>=2, but you'll have rlp 1.2.0 which is incompatible.
[...]
$ ./myth
[...]
ModuleNotFoundError: No module named 'blake2b'
$ pip install blake2b-py
$ ./myth
[...] mythril/mythril/laser/ethereum/instructions.py:2394: SyntaxWarning: "is not" with a literal. Did you mean "!="?
  with_value = function_name is not "staticcall"

[ myth displays usage, no error except warning above]

The warning appears only the first time myth is called, apparently during compilation.

Environment

• Mythril version: commit 82d2fa81964cebe7a97991dd5e1a6a2d9bba83ff
• Python version: 3.8.10
• OS and Version: Ubuntu 20.04.3 LTS

[gsalzer]

Thx. After

$ . venv/bin/activate
$ pip install py-evm==0.3.0a13

all requirements are satisfied now.

[norhh]

py-evm requirement should be fixed now