I tried pip install ChatterBot and ended up with error. I am using Python 3.8 64 bit rc1.
I do have installed all build tools. Please help me!
Here is the powershell snippet -
Collecting ChatterBot Using cached ChatterBot-1.0.5-py2.py3-none-any.whl (67 kB) Collecting pymongo<4.0,>=3.3 Downloading pymongo-3.10.1-cp38-cp38-win_amd64.whl (355 kB) |████████████████████████████████| 355 kB 78 kB/s Collecting nltk<4.0,>=3.2 Using cached nltk-3.5.zip (1.4 MB) Collecting python-dateutil<2.8,>=2.7 Using cached python_dateutil-2.7.5-py2.py3-none-any.whl (225 kB) Requirement already satisfied: pytz in c:\users\srpx3\appdata\local\programs\python\python38\lib\site-packages (from ChatterBot) (2020.1) Collecting spacy<2.2,>=2.1 Using cached spacy-2.1.9.tar.gz (30.7 MB) Installing build dependencies ... error ERROR: Command errored out with exit status 1: command: 'c:\users\srpx3\appdata\local\programs\python\python38\python.exe' 'c:\users\srpx3\appdata\local\programs\python\python38\lib\site-packages\pip' install --ignore-installed --no-user --prefix 'C:\Users\srpx3\AppData\Local\Temp\pip-build-env-h_upx5_5\overlay' --no-warn-script-location --no-binary :none: --only-binary :none: -i https://pypi.org/simple -- setuptools 'wheel>0.32.0,<0.33.0' Cython 'cymem>=2.0.2,<2.1.0' 'preshed>=2.0.1,<2.1.0' 'murmurhash>=0.28.0,<1.1.0' 'thinc>=7.0.8,<7.1.0' cwd: None Complete output (105 lines): Collecting setuptools Using cached setuptools-46.2.0-py3-none-any.whl (582 kB) Collecting wheel<0.33.0,>0.32.0 Using cached wheel-0.32.3-py2.py3-none-any.whl (21 kB) Collecting Cython Using cached Cython-0.29.17-cp38-cp38-win_amd64.whl (1.7 MB) Collecting cymem<2.1.0,>=2.0.2 Using cached cymem-2.0.3-cp38-cp38-win_amd64.whl (33 kB) Collecting preshed<2.1.0,>=2.0.1 Using cached preshed-2.0.1.tar.gz (113 kB) Collecting murmurhash<1.1.0,>=0.28.0 Using cached murmurhash-1.0.2-cp38-cp38-win_amd64.whl (20 kB) Collecting thinc<7.1.0,>=7.0.8 Using cached thinc-7.0.8.tar.gz (1.9 MB) Collecting blis<0.3.0,>=0.2.1 Using cached blis-0.2.4.tar.gz (1.5 MB) Collecting wasabi<1.1.0,>=0.0.9 Using cached wasabi-0.6.0-py3-none-any.whl (20 kB) Collecting srsly<1.1.0,>=0.0.6 Downloading srsly-1.0.2-cp38-cp38-win_amd64.whl (181 kB) Collecting numpy>=1.7.0 Using cached numpy-1.18.4-cp38-cp38-win_amd64.whl (12.8 MB) Collecting plac<1.0.0,>=0.9.6 Using cached plac-0.9.6-py2.py3-none-any.whl (20 kB) Collecting tqdm<5.0.0,>=4.10.0 Using cached tqdm-4.46.0-py2.py3-none-any.whl (63 kB) Building wheels for collected packages: preshed, thinc, blis Building wheel for preshed (setup.py): started Building wheel for preshed (setup.py): finished with status 'done' Created wheel for preshed: filename=preshed-2.0.1-cp38-cp38m-win_amd64.whl size=73256 sha256=459c0e938c749929253676d80c906a5dfa1b6a6374fdda9bf585252581ea3dfb Stored in directory: c:\users\srpx3\appdata\local\pip\cache\wheels\5a\d0\29\7f6993a759349eae3d0ecca7e2fbc88acdd8650b25e6c6ad8a Building wheel for thinc (setup.py): started Building wheel for thinc (setup.py): finished with status 'done' Created wheel for thinc: filename=thinc-7.0.8-cp38-cp38-win_amd64.whl size=1961138 sha256=499dc0f5fd5961530ac32c787e92ff117e6f5c723853db28a783350490089483 Stored in directory: c:\users\srpx3\appdata\local\pip\cache\wheels\f4\5b\cc\8a96be826c5d22ca28e3c30f785b22edc57ffb2d349fa780be Building wheel for blis (setup.py): started Building wheel for blis (setup.py): finished with status 'error' ERROR: Command errored out with exit status 1: command: 'c:\users\srpx3\appdata\local\programs\python\python38\python.exe' -u -c 'import sys, setuptools, tokenize; sys.argv[0] = '"'"'C:\Users\srpx3\AppData\Local\Temp\pip-install-y1sv2rk2\blis\setup.py'"'"'; file='"'"'C:\Users\srpx3\AppData\Local\Temp\pip-install-y1sv2rk2\blis\setup.py'"'"';f=getattr(tokenize, '"'"'open'"'"', open)(file);code=f.read().replace('"'"'\r\n'"'"', '"'"'\n'"'"');f.close();exec(compile(code, file, '"'"'exec'"'"'))' bdist_wheel -d 'C:\Users\srpx3\AppData\Local\Temp\pip-wheel-c8gofksg' cwd: C:\Users\srpx3\AppData\Local\Temp\pip-install-y1sv2rk2\blis\ Complete output (25 lines): BLIS_COMPILER? None running bdist_wheel running build running build_py creating build creating build\lib.win-amd64-3.8 creating build\lib.win-amd64-3.8\blis copying blis\about.py -> build\lib.win-amd64-3.8\blis copying blis\benchmark.py -> build\lib.win-amd64-3.8\blis copying blis__init__.py -> build\lib.win-amd64-3.8\blis creating build\lib.win-amd64-3.8\blis\tests copying blis\tests\common.py -> build\lib.win-amd64-3.8\blis\tests copying blis\tests\test_dotv.py -> build\lib.win-amd64-3.8\blis\tests copying blis\tests\test_gemm.py -> build\lib.win-amd64-3.8\blis\tests copying blis\tests__init__.py -> build\lib.win-amd64-3.8\blis\tests copying blis\cy.pyx -> build\lib.win-amd64-3.8\blis copying blis\py.pyx -> build\lib.win-amd64-3.8\blis copying blis\cy.pxd -> build\lib.win-amd64-3.8\blis copying blis__init__.pxd -> build\lib.win-amd64-3.8\blis running build_ext error: [WinError 2] The system cannot find the file specified msvc py_compiler msvc {'LS_COLORS': 'rs=0:di=01;34:ln=01;36:mh=00:pi=40;33:so=01;35:do=01;35:bd=40;33;01:cd=40;33;01:or=40;31;01:mi=00:su=37;41:sg=30;43:ca=30;41:tw=30;42:ow=34;42:st=37;44:ex=01;32:.tar=01;31:.tgz=01;31:.arc=01;31:.arj=01;31:.taz=01;31:.lha=01;31:.lz4=01;31:.lzh=01;31:.lzma=01;31:.tlz=01;31:.txz=01;31:.tzo=01;31:.t7z=01;31:.zip=01;31:.z=01;31:.Z=01;31:.dz=01;31:.gz=01;31:.lrz=01;31:.lz=01;31:.lzo=01;31:.xz=01;31:.zst=01;31:.tzst=01;31:.bz2=01;31:.bz=01;31:.tbz=01;31:.tbz2=01;31:.tz=01;31:.deb=01;31:.rpm=01;31:.jar=01;31:.war=01;31:.ear=01;31:.sar=01;31:.rar=01;31:.alz=01;31:.ace=01;31:.zoo=01;31:.cpio=01;31:.7z=01;31:.rz=01;31:.cab=01;31:.wim=01;31:.swm=01;31:.dwm=01;31:.esd=01;31:.jpg=01;35:.jpeg=01;35:.mjpg=01;35:.mjpeg=01;35:.gif=01;35:.bmp=01;35:.pbm=01;35:.pgm=01;35:.ppm=01;35:.tga=01;35:.xbm=01;35:.xpm=01;35:.tif=01;35:.tiff=01;35:.png=01;35:.svg=01;35:.svgz=01;35:.mng=01;35:.pcx=01;35:.mov=01;35:.mpg=01;35:.mpeg=01;35:.m2v=01;35:.mkv=01;35:.webm=01;35:.ogm=01;35:.mp4=01;35:.m4v=01;35:.mp4v=01;35:.vob=01;35:.qt=01;35:.nuv=01;35:.wmv=01;35:.asf=01;35:.rm=01;35:.rmvb=01;35:.flc=01;35:.avi=01;35:.fli=01;35:.flv=01;35:.gl=01;35:.dl=01;35:.xcf=01;35:.xwd=01;35:.yuv=01;35:.cgm=01;35:.emf=01;35:.ogv=01;35:.ogx=01;35:.aac=00;36:.au=00;36:.flac=00;36:.m4a=00;36:.mid=00;36:.midi=00;36:.mka=00;36:.mp3=00;36:.mpc=00;36:.ogg=00;36:.ra=00;36:.wav=00;36:.oga=00;36:.opus=00;36:.spx=00;36:.xspf=00;36:', 'HOSTTYPE': 'x86_64', 'LESSCLOSE': '/usr/bin/lesspipe %s %s', 'LANG': 'C.UTF-8', 'OLDPWD': '/home/matt/repos/flame-blis', 'VIRTUAL_ENV': '/home/matt/repos/cython-blis/env3.6', 'USER': 'matt', 'PWD': '/home/matt/repos/cython-blis', 'HOME': '/home/matt', 'NAME': 'LAPTOP-OMKOB3VM', 'XDG_DATA_DIRS': '/usr/local/share:/usr/share:/var/lib/snapd/desktop', 'SHELL': '/bin/bash', 'TERM': 'xterm-256color', 'SHLVL': '1', 'LOGNAME': 'matt', 'PATH': '/home/matt/repos/cython-blis/env3.6/bin:/tmp/google-cloud-sdk/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/usr/local/games:/mnt/c/Users/matt/Documents/cmder/vendor/conemu-maximus5/ConEmu/Scripts:/mnt/c/Users/matt/Documents/cmder/vendor/conemu-maximus5:/mnt/c/Users/matt/Documents/cmder/vendor/conemu-maximus5/ConEmu:/mnt/c/Python37/Scripts:/mnt/c/Python37:/mnt/c/Program Files (x86)/Intel/Intel(R) Management Engine Components/iCLS:/mnt/c/Program Files/Intel/Intel(R) Management Engine Components/iCLS:/mnt/c/Windows/System32:/mnt/c/Windows:/mnt/c/Windows/System32/wbem:/mnt/c/Windows/System32/WindowsPowerShell/v1.0:/mnt/c/Program Files (x86)/Intel/Intel(R) Management Engine Components/DAL:/mnt/c/Program Files/Intel/Intel(R) Management Engine Components/DAL:/mnt/c/Program Files (x86)/Intel/Intel(R) Management Engine Components/IPT:/mnt/c/Program Files/Intel/Intel(R) Management Engine Components/IPT:/mnt/c/Program Files/Intel/WiFi/bin:/mnt/c/Program Files/Common Files/Intel/WirelessCommon:/mnt/c/Program Files (x86)/NVIDIA Corporation/PhysX/Common:/mnt/c/ProgramData/chocolatey/bin:/mnt/c/Program Files/Git/cmd:/mnt/c/Program Files/LLVM/bin:/mnt/c/Windows/System32:/mnt/c/Windows:/mnt/c/Windows/System32/wbem:/mnt/c/Windows/System32/WindowsPowerShell/v1.0:/mnt/c/Windows/System32/OpenSSH:/mnt/c/Program Files/nodejs:/mnt/c/Users/matt/AppData/Local/Microsoft/WindowsApps:/mnt/c/Users/matt/AppData/Local/Programs/Microsoft VS Code/bin:/mnt/c/Users/matt/AppData/Roaming/npm:/snap/bin:/mnt/c/Program Files/Oracle/VirtualBox', 'PS1': '(env3.6) \[\e]0;\u@\h: \w\a\]${debian_chroot:+($debian_chroot)}\[\033[01;32m\]\u@\h\[\033[00m\]:\[\033[01;34m\]\w\[\033[00m\]\$ ', 'VAGRANT_HOME': '/home/matt/.vagrant.d/', 'LESSOPEN': '| /usr/bin/lesspipe %s', '_': '/home/matt/repos/cython-blis/env3.6/bin/python'} clang -c C:\Users\srpx3\AppData\Local\Temp\pip-install-y1sv2rk2\blis\blis_src\config\bulldozer\bli_cntx_init_bulldozer.c -o C:\Users\srpx3\AppData\Local\Temp\tmp4il6g9mr\bli_cntx_init_bulldozer.o -O2 -funroll-all-loops -std=c99 -D_POSIX_C_SOURCE=200112L -DBLIS_VERSION_STRING="0.5.0-6" -DBLIS_IS_BUILDING_LIBRARY -Iinclude\windows-x86_64 -I.\frame\3\ -I.\frame\ind\ukernels\ -I.\frame\1m\ -I.\frame\1f\ -I.\frame\1\ -I.\frame\include -IC:\Users\srpx3\AppData\Local\Temp\pip-install-y1sv2rk2\blis\blis_src\include\windows-x86_64 ---------------------------------------- ERROR: Failed building wheel for blis Running setup.py clean for blis Successfully built preshed thinc Failed to build blis Installing collected packages: setuptools, wheel, Cython, cymem, preshed, murmurhash, numpy, blis, wasabi, srsly, plac, tqdm, thinc Running setup.py install for blis: started Running setup.py install for blis: finished with status 'error' ERROR: Command errored out with exit status 1: command: 'c:\users\srpx3\appdata\local\programs\python\python38\python.exe' -u -c 'import sys, setuptools, tokenize; sys.argv[0] = '"'"'C:\Users\srpx3\AppData\Local\Temp\pip-install-y1sv2rk2\blis\setup.py'"'"'; file='"'"'C:\Users\srpx3\AppData\Local\Temp\pip-install-y1sv2rk2\blis\setup.py'"'"';f=getattr(tokenize, '"'"'open'"'"', open)(file);code=f.read().replace('"'"'\r\n'"'"', '"'"'\n'"'"');f.close();exec(compile(code, file, '"'"'exec'"'"'))' install --record 'C:\Users\srpx3\AppData\Local\Temp\pip-record-e10f22k2\install-record.txt' --single-version-externally-managed --prefix 'C:\Users\srpx3\AppData\Local\Temp\pip-build-env-h_upx5_5\overlay' --compile --install-headers 'C:\Users\srpx3\AppData\Local\Temp\pip-build-env-h_upx5_5\overlay\Include\blis' cwd: C:\Users\srpx3\AppData\Local\Temp\pip-install-y1sv2rk2\blis\ Complete output (25 lines): BLIS_COMPILER? None running install running build running build_py creating build creating build\lib.win-amd64-3.8 creating build\lib.win-amd64-3.8\blis copying blis\about.py -> build\lib.win-amd64-3.8\blis copying blis\benchmark.py -> build\lib.win-amd64-3.8\blis copying blis__init__.py -> build\lib.win-amd64-3.8\blis creating build\lib.win-amd64-3.8\blis\tests copying blis\tests\common.py -> build\lib.win-amd64-3.8\blis\tests copying blis\tests\test_dotv.py -> build\lib.win-amd64-3.8\blis\tests copying blis\tests\test_gemm.py -> build\lib.win-amd64-3.8\blis\tests copying blis\tests__init__.py -> build\lib.win-amd64-3.8\blis\tests copying blis\cy.pyx -> build\lib.win-amd64-3.8\blis copying blis\py.pyx -> build\lib.win-amd64-3.8\blis copying blis\cy.pxd -> build\lib.win-amd64-3.8\blis copying blis__init__.pxd -> build\lib.win-amd64-3.8\blis running build_ext error: [WinError 2] The system cannot find the file specified msvc py_compiler msvc {'LS_COLORS': 'rs=0:di=01;34:ln=01;36:mh=00:pi=40;33:so=01;35:do=01;35:bd=40;33;01:cd=40;33;01:or=40;31;01:mi=00:su=37;41:sg=30;43:ca=30;41:tw=30;42:ow=34;42:st=37;44:ex=01;32:.tar=01;31:.tgz=01;31:.arc=01;31:.arj=01;31:.taz=01;31:.lha=01;31:.lz4=01;31:.lzh=01;31:.lzma=01;31:.tlz=01;31:.txz=01;31:.tzo=01;31:.t7z=01;31:.zip=01;31:.z=01;31:.Z=01;31:.dz=01;31:.gz=01;31:.lrz=01;31:.lz=01;31:.lzo=01;31:.xz=01;31:.zst=01;31:.tzst=01;31:.bz2=01;31:.bz=01;31:.tbz=01;31:.tbz2=01;31:.tz=01;31:.deb=01;31:.rpm=01;31:.jar=01;31:.war=01;31:.ear=01;31:.sar=01;31:.rar=01;31:.alz=01;31:.ace=01;31:.zoo=01;31:.cpio=01;31:.7z=01;31:.rz=01;31:.cab=01;31:.wim=01;31:.swm=01;31:.dwm=01;31:.esd=01;31:.jpg=01;35:.jpeg=01;35:.mjpg=01;35:.mjpeg=01;35:.gif=01;35:.bmp=01;35:.pbm=01;35:.pgm=01;35:.ppm=01;35:.tga=01;35:.xbm=01;35:.xpm=01;35:.tif=01;35:.tiff=01;35:.png=01;35:.svg=01;35:.svgz=01;35:.mng=01;35:.pcx=01;35:.mov=01;35:.mpg=01;35:.mpeg=01;35:.m2v=01;35:.mkv=01;35:.webm=01;35:.ogm=01;35:.mp4=01;35:.m4v=01;35:.mp4v=01;35:.vob=01;35:.qt=01;35:.nuv=01;35:.wmv=01;35:.asf=01;35:.rm=01;35:.rmvb=01;35:.flc=01;35:.avi=01;35:.fli=01;35:.flv=01;35:.gl=01;35:.dl=01;35:.xcf=01;35:.xwd=01;35:.yuv=01;35:.cgm=01;35:.emf=01;35:.ogv=01;35:.ogx=01;35:.aac=00;36:.au=00;36:.flac=00;36:.m4a=00;36:.mid=00;36:.midi=00;36:.mka=00;36:.mp3=00;36:.mpc=00;36:.ogg=00;36:.ra=00;36:.wav=00;36:.oga=00;36:.opus=00;36:.spx=00;36:.xspf=00;36:', 'HOSTTYPE': 'x86_64', 'LESSCLOSE': '/usr/bin/lesspipe %s %s', 'LANG': 'C.UTF-8', 'OLDPWD': '/home/matt/repos/flame-blis', 'VIRTUAL_ENV': '/home/matt/repos/cython-blis/env3.6', 'USER': 'matt', 'PWD': '/home/matt/repos/cython-blis', 'HOME': '/home/matt', 'NAME': 'LAPTOP-OMKOB3VM', 'XDG_DATA_DIRS': '/usr/local/share:/usr/share:/var/lib/snapd/desktop', 'SHELL': '/bin/bash', 'TERM': 'xterm-256color', 'SHLVL': '1', 'LOGNAME': 'matt', 'PATH': '/home/matt/repos/cython-blis/env3.6/bin:/tmp/google-cloud-sdk/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/usr/local/games:/mnt/c/Users/matt/Documents/cmder/vendor/conemu-maximus5/ConEmu/Scripts:/mnt/c/Users/matt/Documents/cmder/vendor/conemu-maximus5:/mnt/c/Users/matt/Documents/cmder/vendor/conemu-maximus5/ConEmu:/mnt/c/Python37/Scripts:/mnt/c/Python37:/mnt/c/Program Files (x86)/Intel/Intel(R) Management Engine Components/iCLS:/mnt/c/Program Files/Intel/Intel(R) Management Engine Components/iCLS:/mnt/c/Windows/System32:/mnt/c/Windows:/mnt/c/Windows/System32/wbem:/mnt/c/Windows/System32/WindowsPowerShell/v1.0:/mnt/c/Program Files (x86)/Intel/Intel(R) Management Engine Components/DAL:/mnt/c/Program Files/Intel/Intel(R) Management Engine Components/DAL:/mnt/c/Program Files (x86)/Intel/Intel(R) Management Engine Components/IPT:/mnt/c/Program Files/Intel/Intel(R) Management Engine Components/IPT:/mnt/c/Program Files/Intel/WiFi/bin:/mnt/c/Program Files/Common Files/Intel/WirelessCommon:/mnt/c/Program Files (x86)/NVIDIA Corporation/PhysX/Common:/mnt/c/ProgramData/chocolatey/bin:/mnt/c/Program Files/Git/cmd:/mnt/c/Program Files/LLVM/bin:/mnt/c/Windows/System32:/mnt/c/Windows:/mnt/c/Windows/System32/wbem:/mnt/c/Windows/System32/WindowsPowerShell/v1.0:/mnt/c/Windows/System32/OpenSSH:/mnt/c/Program Files/nodejs:/mnt/c/Users/matt/AppData/Local/Microsoft/WindowsApps:/mnt/c/Users/matt/AppData/Local/Programs/Microsoft VS Code/bin:/mnt/c/Users/matt/AppData/Roaming/npm:/snap/bin:/mnt/c/Program Files/Oracle/VirtualBox', 'PS1': '(env3.6) \[\e]0;\u@\h: \w\a\]${debian_chroot:+($debian_chroot)}\[\033[01;32m\]\u@\h\[\033[00m\]:\[\033[01;34m\]\w\[\033[00m\]\$ ', 'VAGRANT_HOME': '/home/matt/.vagrant.d/', 'LESSOPEN': '| /usr/bin/lesspipe %s', '_': '/home/matt/repos/cython-blis/env3.6/bin/python'} clang -c C:\Users\srpx3\AppData\Local\Temp\pip-install-y1sv2rk2\blis\blis_src\config\bulldozer\bli_cntx_init_bulldozer.c -o C:\Users\srpx3\AppData\Local\Temp\tmpnva1c606\bli_cntx_init_bulldozer.o -O2 -funroll-all-loops -std=c99 -D_POSIX_C_SOURCE=200112L -DBLIS_VERSION_STRING="0.5.0-6" -DBLIS_IS_BUILDING_LIBRARY -Iinclude\windows-x86_64 -I.\frame\3\ -I.\frame\ind\ukernels\ -I.\frame\1m\ -I.\frame\1f\ -I.\frame\1\ -I.\frame\include -IC:\Users\srpx3\AppData\Local\Temp\pip-install-y1sv2rk2\blis\blis_src\include\windows-x86_64 ---------------------------------------- ERROR: Command errored out with exit status 1: 'c:\users\srpx3\appdata\local\programs\python\python38\python.exe' -u -c 'import sys, setuptools, tokenize; sys.argv[0] = '"'"'C:\Users\srpx3\AppData\Local\Temp\pip-install-y1sv2rk2\blis\setup.py'"'"'; file='"'"'C:\Users\srpx3\AppData\Local\Temp\pip-install-y1sv2rk2\blis\setup.py'"'"';f=getattr(tokenize, '"'"'open'"'"', open)(file);code=f.read().replace('"'"'\r\n'"'"', '"'"'\n'"'"');f.close();exec(compile(code, file, '"'"'exec'"'"'))' install --record 'C:\Users\srpx3\AppData\Local\Temp\pip-record-e10f22k2\install-record.txt' --single-version-externally-managed --prefix 'C:\Users\srpx3\AppData\Local\Temp\pip-build-env-h_upx5_5\overlay' --compile --install-headers 'C:\Users\srpx3\AppData\Local\Temp\pip-build-env-h_upx5_5\overlay\Include\blis' Check the logs for full command output.
---------------------------------------- ERROR: Command errored out with exit status 1: 'c:\users\srpx3\appdata\local\programs\python\python38\python.exe' 'c:\users\srpx3\appdata\local\programs\python\python38\lib\site-packages\pip' install --ignore-installed --no-user --prefix 'C:\Users\srpx3\AppData\Local\Temp\pip-build-env-h_upx5_5\overlay' --no-warn-script-location --no-binary :none: --only-binary :none: -i https://pypi.org/simple -- setuptools 'wheel>0.32.0,<0.33.0' Cython 'cymem>=2.0.2,<2.1.0' 'preshed>=2.0.1,<2.1.0' 'murmurhash>=0.28.0,<1.1.0' 'thinc>=7.0.8,<7.1.0' Check the logs for full command output.
Instead of pip install chatterbot, try pip install sugaroid-chatterbot.