Difference between revisions of "Python"
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| − | + | = Python 3.6 type checking = | |
| − | + | ||
| + | Make sure python is 3.6 or above | ||
<pre> python3 -m pip install -U mypy</pre> | <pre> python3 -m pip install -U mypy</pre> | ||
| Line 19: | Line 20: | ||
<pre> | <pre> | ||
mypy testtype.py | mypy testtype.py | ||
| + | </pre> | ||
| + | |||
| + | == install pyenv == | ||
| + | |||
| + | <pre> | ||
| + | |||
| + | sudo apt-get update; sudo apt-get install make build-essential libssl-dev zlib1g-dev \ | ||
| + | libbz2-dev libreadline-dev libsqlite3-dev wget curl llvm \ | ||
| + | libncursesw5-dev xz-utils tk-dev libxml2-dev libxmlsec1-dev libffi-dev liblzma-dev | ||
| + | |||
| + | curl https://pyenv.run | bash | ||
| + | |||
| + | vim ~/.bashrc | ||
| + | |||
| + | # add | ||
| + | # pyenv | ||
| + | export PATH="$HOME/.pyenv/bin:$PATH" | ||
| + | eval "$(pyenv init --path)" | ||
| + | eval "$(pyenv virtualenv-init -)" | ||
| + | |||
| + | |||
| + | pyenv install 3.8.16 | ||
| + | pyenv global 3.8.16 | ||
| + | |||
</pre> | </pre> | ||
Latest revision as of 03:14, 14 August 2023
Python 3.6 type checking
Make sure python is 3.6 or above
python3 -m pip install -U mypy
Example code with typecheck
from typing import List
Vector = List[float]
def scale(scalar: float, vector: Vector) -> Vector:
return [scalar * num for num in vector]
# typechecks; a list of floats qualifies as a Vector.
new_vector = scale(2.0, [1.0, -4.2, 5.4])
print(new_vector)
To test typing, just run
mypy testtype.py
install pyenv
sudo apt-get update; sudo apt-get install make build-essential libssl-dev zlib1g-dev \ libbz2-dev libreadline-dev libsqlite3-dev wget curl llvm \ libncursesw5-dev xz-utils tk-dev libxml2-dev libxmlsec1-dev libffi-dev liblzma-dev curl https://pyenv.run | bash vim ~/.bashrc # add # pyenv export PATH="$HOME/.pyenv/bin:$PATH" eval "$(pyenv init --path)" eval "$(pyenv virtualenv-init -)" pyenv install 3.8.16 pyenv global 3.8.16
