tkinter doesn't work on slim-buster Python images

[Tiksagol]

tkinter doesn't work on slim-buster images -

>> docker run --rm -ti python:3.8-slim-buster python -c "**import tkinter**"
Traceback (most recent call last):
  File "<string>", line 1, in <module>
  File "/usr/local/lib/python3.8/tkinter/__init__.py", line 36, in <module>
    import _tkinter # If this fails your Python may not be configured for Tk
**ImportError: libtk8.6.so: cannot open shared object file: No such file or directory**

[yosifkit]

In order to keep the slim images actually slim the library is not kept on purpose. See #122 (comment).

python/Dockerfile-slim.template

Lines 109 to 116 in 3ebdcfd

	&& find /usr/local -type f -executable -not \( -name '*tkinter*' \) -exec ldd '{}' ';' \
	| awk '/=>/ { print $(NF-1) }' \
	| sort -u \
	| xargs -r dpkg-query --search \
	| cut -d: -f1 \
	| sort -u \
	| xargs -r apt-mark manual \
	&& apt-get purge -y --auto-remove -o APT::AutoRemove::RecommendsImportant=false \

You should be able to just install the tk package from apt, but it has quite a few dependencies:

docker run -it --rm python:3.8-slim-buster bash
root@419462f4cf20:/# apt-get update
Get:1 http://deb.debian.org/debian buster InRelease [121 kB]
Get:2 http://security.debian.org/debian-security buster/updates InRelease [65.4 kB]
Get:3 http://deb.debian.org/debian buster-updates InRelease [49.3 kB]
Get:4 http://security.debian.org/debian-security buster/updates/main amd64 Packages [198 kB]
Get:5 http://deb.debian.org/debian buster/main amd64 Packages [7905 kB]
Get:6 http://deb.debian.org/debian buster-updates/main amd64 Packages [7380 B]
Fetched 8347 kB in 1s (8615 kB/s)                         
Reading package lists... Done
root@419462f4cf20:/# apt-get install tk
Reading package lists... Done
Building dependency tree       
Reading state information... Done
The following additional packages will be installed:
  fontconfig-config fonts-dejavu-core libbsd0 libdrm-amdgpu1 libdrm-common libdrm-intel1
  libdrm-nouveau2 libdrm-radeon1 libdrm2 libedit2 libelf1 libfontconfig1 libfontenc1
  libfreetype6 libgl1 libgl1-mesa-dri libglapi-mesa libglvnd0 libglx-mesa0 libglx0
  libice6 libllvm7 libpciaccess0 libpng16-16 libsensors-config libsensors5 libsm6
  libtcl8.6 libtk8.6 libutempter0 libx11-6 libx11-data libx11-xcb1 libxau6 libxaw7
  libxcb-dri2-0 libxcb-dri3-0 libxcb-glx0 libxcb-present0 libxcb-shape0 libxcb-sync1
  libxcb1 libxcomposite1 libxdamage1 libxdmcp6 libxext6 libxfixes3 libxft2 libxi6
  libxinerama1 libxmu6 libxmuu1 libxpm4 libxrandr2 libxrender1 libxshmfence1 libxss1
  libxt6 libxtst6 libxv1 libxxf86dga1 libxxf86vm1 lsb-base sensible-utils tcl tcl8.6
  tk8.6 ucf x11-common x11-utils xbitmaps xterm
Suggested packages:
  pciutils lm-sensors tcl-tclreadline mesa-utils xfonts-cyrillic
The following NEW packages will be installed:
  fontconfig-config fonts-dejavu-core libbsd0 libdrm-amdgpu1 libdrm-common libdrm-intel1
  libdrm-nouveau2 libdrm-radeon1 libdrm2 libedit2 libelf1 libfontconfig1 libfontenc1
  libfreetype6 libgl1 libgl1-mesa-dri libglapi-mesa libglvnd0 libglx-mesa0 libglx0
  libice6 libllvm7 libpciaccess0 libpng16-16 libsensors-config libsensors5 libsm6
  libtcl8.6 libtk8.6 libutempter0 libx11-6 libx11-data libx11-xcb1 libxau6 libxaw7
  libxcb-dri2-0 libxcb-dri3-0 libxcb-glx0 libxcb-present0 libxcb-shape0 libxcb-sync1
  libxcb1 libxcomposite1 libxdamage1 libxdmcp6 libxext6 libxfixes3 libxft2 libxi6
  libxinerama1 libxmu6 libxmuu1 libxpm4 libxrandr2 libxrender1 libxshmfence1 libxss1
  libxt6 libxtst6 libxv1 libxxf86dga1 libxxf86vm1 lsb-base sensible-utils tcl tcl8.6 tk
  tk8.6 ucf x11-common x11-utils xbitmaps xterm
0 upgraded, 73 newly installed, 0 to remove and 6 not upgraded.
Need to get 29.7 MB of archives.
After this operation, 238 MB of additional disk space will be used.
Do you want to continue? [Y/n] ^C

[YuyaR]

@yosifkit Did you successfully build the image though? Because after the 'Do you want to continue? [Y/n]' mine just aborted. I am not sure how to circumvent the prompt.

[tianon]

Add -y to the apt-get install command.