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+---
+draft: false
+title: 'Learning Apache Flink S01E05: Installing PyFlink (with some bumps along the way)'
+date: "2023-10-25T15:27:22Z"
+image: "/images/2023/10/pyflink1.webp"
+thumbnail: "/images/2023/10/IMG_6173.webp"
+credit: "https://twitter.com/rmoff/"
+categories:
+- LAF
+- Apache Flink
+- PyFlink
+---
+
+When I started [my journey learning Apache Flink](/categories/laf/) one of the things that several people expressed an interest in hearing more about was PyFlink.  This appeals to me too, because whilst Java is just something I don't know and feels beyond me to try and learn, Python is something that I know enough of to at least hack my way around it. I've previously [had fun with PySpark](/2022/09/16/data-engineering-in-2022-exploring-lakefs-with-jupyter-and-pyspark/), and whilst [Flink SQL](/categories/flink-sql/) will probably be one of my main focusses, I also want to get a feel for PyFlink. 
+
+The first step to using PyFlink is installing it - which should be simple, right? 
+
+<!--more-->
+
+Right? 
+
+![Padame looking concerned when she realises that something isn't as she'd assumed](/images/2023/10/padame.webp)
+
+## Step 1: Install PyFlink…
+
+The [docs](https://nightlies.apache.org/flink/flink-docs-release-1.15/docs/dev/python/datastream_tutorial/#how-to-follow-along) are a useful start here, and tell us that we need to install Flink as a Python library first: 
+
+```
+$ pip install apache-flink
+```
+
+## `No matching distribution found for numpy==1.21.4`
+
+This failed with the following output (truncated, for readability)
+
+```
+$ pip install apache-flink
+Collecting apache-flink
+  Using cached apache-flink-1.18.0.tar.gz (1.2 MB)
+  Preparing metadata (setup.py) ... done
+[…]
+  Installing build dependencies ... error
+  error: subprocess-exited-with-error
+
+  × pip subprocess to install build dependencies did not run successfully.
+  │ exit code: 1
+  ╰─> [12 lines of output]
+      Collecting packaging==20.5
+        Using cached packaging-20.5-py2.py3-none-any.whl (35 kB)
+      Collecting setuptools==59.2.0
+        Using cached setuptools-59.2.0-py3-none-any.whl (952 kB)
+      Collecting wheel==0.37.0
+        Using cached wheel-0.37.0-py2.py3-none-any.whl (35 kB)
+      ERROR: Ignored the following versions that require a different python version: 1.21.2 Requires-Python >=3.7,<3.11; 1.21.3 Requires-Python >=3.7,<3.11; 1.21.4 Requires-Python >=3.7,<3.11; 1.21.5 Requires-Python >=3.7,<3.11; 1.21.6 Requires-Python >=3.7,<3.11
+      ERROR: Could not find a version that satisfies the requirement numpy==1.21.4 (from versions: 1.3.0, 1.4.1, 1.5.0, 1.5.1, 1.6.0, 1.6.1, 1.6.2, 1.7.0, 1.7.1, 1.7.2, 1.8.0, 1.8.1, 1.8.2, 1.9.0, 1.9.1, 1.9.2, 1.9.3, 1.10.0.post2, 1.10.1, 1.10.2, 1.10.4, 1.11.0, 1.11.1, 1.11.2, 1.11.3, 1.12.0, 1.12.1, 1.13.0, 1.13.1, 1.13.3, 1.14.0, 1.14.1, 1.14.2, 1.14.3, 1.14.4, 1.14.5, 1.14.6, 1.15.0, 1.15.1, 1.15.2, 1.15.3, 1.15.4, 1.16.0, 1.16.1, 1.16.2, 1.16.3, 1.16.4, 1.16.5, 1.16.6, 1.17.0, 1.17.1, 1.17.2, 1.17.3, 1.17.4, 1.17.5, 1.18.0, 1.18.1, 1.18.2, 1.18.3, 1.18.4, 1.18.5, 1.19.0, 1.19.1, 1.19.2, 1.19.3, 1.19.4, 1.19.5, 1.20.0, 1.20.1, 1.20.2, 1.20.3, 1.21.0, 1.21.1, 1.22.0, 1.22.1, 1.22.2, 1.22.3, 1.22.4, 1.23.0rc1, 1.23.0rc2, 1.23.0rc3, 1.23.0, 1.23.1, 1.23.2, 1.23.3, 1.23.4, 1.23.5, 1.24.0rc1, 1.24.0rc2, 1.24.0, 1.24.1, 1.24.2, 1.24.3, 1.24.4, 1.25.0rc1, 1.25.0, 1.25.1, 1.25.2, 1.26.0b1, 1.26.0rc1, 1.26.0, 1.26.1)
+      ERROR: No matching distribution found for numpy==1.21.4
+
+      [notice] A new release of pip is available: 23.2.1 -> 23.3
+      [notice] To update, run: python3.11 -m pip install --upgrade pip
+      [end of output]
+
+  note: This error originates from a subprocess, and is likely not a problem with pip.
+error: subprocess-exited-with-error
+
+× pip subprocess to install build dependencies did not run successfully.
+│ exit code: 1
+╰─> See above for output.
+
+note: This error originates from a subprocess, and is likely not a problem with pip.
+```
+
+## Try installing the next newest version
+
+Looking at the error I spot `No matching distribution found for numpy==1.21.4` so maybe I just try a different version? 
+
+```
+$ pip install numpy==1.22.0
+Collecting numpy==1.22.0
+  Downloading numpy-1.22.0.zip (11.3 MB)
+     ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ 11.3/11.3 MB 443.6 kB/s eta 0:00:00
+  Installing build dependencies ... done
+  Getting requirements to build wheel ... error
+  error: subprocess-exited-with-error
+
+  × Getting requirements to build wheel did not run successfully.
+  │ exit code: 1
+  ╰─> [93 lines of output]
+[…]
+     AttributeError: fcompiler. Did you mean: 'compiler'?
+      [end of output]
+```
+
+Hey, a different error! I found a GitHub issue for this error that suggests [a newer version](https://github.com/pypa/setuptools/issues/3549#issuecomment-1709347140) of numpy will work
+
+## Try installing the latest version of numpy
+
+```
+$ pip install numpy==1.26.1
+Collecting numpy==1.26.1
+  Downloading numpy-1.26.1-cp311-cp311-macosx_11_0_arm64.whl.metadata (115 kB)
+     ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ 115.1/115.1 kB 471.4 kB/s eta 0:00:00
+Downloading numpy-1.26.1-cp311-cp311-macosx_11_0_arm64.whl (14.0 MB)
+   ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ 14.0/14.0 MB 473.2 kB/s eta 0:00:00
+Installing collected packages: numpy
+Successfully installed numpy-1.26.1
+
+```
+
+Yay! 
+
+But… still no dice with installing PyFlink
+
+```
+$ pip install apache-flink
+[…]
+      ERROR: No matching distribution found for numpy==1.21.4
+      [end of output]
+```
+
+## RTFEM (Read The Fscking Error Message)
+
+Going back to the original error, looking at it more closely and breaking the lines you can see this: 
+
+```
+      ERROR: Ignored the following versions that require a different python version: 
+	  1.21.2 Requires-Python >=3.7,<3.11; 
+	  1.21.3 Requires-Python >=3.7,<3.11; 
+      1.21.4 Requires-Python >=3.7,<3.11; 
+      1.21.5 Requires-Python >=3.7,<3.11; 
+      1.21.6 Requires-Python >=3.7,<3.11
+```
+
+Let's look at my Python version on the system: 
+
+```bash
+$ python3 --version
+Python 3.11.5
+```
+
+So this matches—the numpy install needs less than 3.11 and we're on 3.11.5. 
+
+## Install a different version of Python
+
+A quick Google throws up `pyenv` as a good tool for managing Python versions (let me know if that's not the case!). It installs on my Mac with brew nice and easily: 
+
+```bash
+$ brew install pyenv
+$ echo 'PATH=$(pyenv root)/shims:$PATH' >> ~/.zshrc
+```
+
+Install a new version:
+
+```bash
+$ pyenv install 3.10
+```
+
+Activate the newly-installed version
+
+```shell
+$ pyenv global 3.10.13
+```
+
+Start a new shell to pick up the change, and validate that we're now using this version:
+
+```bash
+$ python --version
+Python 3.10.13
+```
+
+## Try the PyFlink install again
+
+```
+$ pip install apache-flink
+
+[…]
+Successfully installed apache-beam-2.48.0 apache-flink-1.18.0 apache-flink-libraries-1.18.0 avro-python3-1.10.2 certifi-2023.7.22 charset-normalizer-3.3.1 cloudpickle-2.2.1 crcmod-1.7 dill-0.3.1.1 dnspython-2.4.2 docopt-0.6.2 fastavro-1.8.4 fasteners-0.19 find-libpython-0.3.1 grpcio-1.59.0 hdfs-2.7.3 httplib2-0.22.0 idna-3.4 numpy-1.24.4 objsize-0.6.1 orjson-3.9.9 pandas-2.1.1 pemja-0.3.0 proto-plus-1.22.3 protobuf-4.23.4 py4j-0.10.9.7 pyarrow-11.0.0 pydot-1.4.2 pymongo-4.5.0 pyparsing-3.1.1 python-dateutil-2.8.2 pytz-2023.3.post1 regex-2023.10.3 requests-2.31.0 six-1.16.0 typing-extensions-4.8.0 tzdata-2023.3 urllib3-2.0.7 zstandard-0.21.0
+
+```
+
+👏 Success! 
+
+Now to go and actually use PyFlink…stay tuned :-D
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