i3pystatus

from i3pystatus import Status

status = Status(standalone=True)

# Displays clock like this:
# Tue 30 Jul 11:59:46 PM KW31
#                          ^-- calendar week
status.register("clock",
    format=" %X ",)

# Shows your CPU temperature, if you have a Intel CPU
status.register("temp",
    format="CPU:{temp:.0f}°C",)

# The battery monitor has many formatting options, see README for details

# This would look like this, when discharging (or charging)
# ↓14.22W 56.15% [77.81%] 2h:41m
# And like this if full:
# =14.22W 100.0% [91.21%]
#
# This would also display a desktop notification (via D-Bus) if the percentage
# goes below 5 percent while discharging. The block will also color RED.
# If you don't have a desktop notification demon yet, take a look at dunst:
#   http://www.knopwob.org/dunst/
status.register("battery",
    format=" {status}/{percentage:.2f}% {remaining:%E%hh:%Mm} ",
    alert=True,
    alert_percentage=5,
    status={
        "DIS": "↓",
        "CHR": "↑",
        "FULL": "=",
    },)

# Shows disk usage of /
# Format:
# 42/128G [86G]
status.register("disk",
    path="/",
    format=" root:{used}/{total}G ",)

status.run()