-r required.txt

###############
# Recommended #
###############

# lxml - for XML processing (XLIFF, TMX, TBX, ts, Android)
lxml>=4.0,!=4.3.1

# Faster matching in e.g. pot2po
python-Levenshtein>=0.12

# Encoding detection
chardet==3.0.4

# To provide translations for language names without need for OS package.
pycountry==19.8.18

# CSV based formats on Python 2
backports.csv; python_version < '3.0'
