This Python example code get uptime in second, run on Raspberry Pi:
import os
uptime = os.popen("awk '{print $1}' /proc/uptime").readline()
print("uptime(sec) = "+uptime)
import os
uptime = os.popen("awk '{print $1}' /proc/uptime").readline()
print("uptime(sec) = "+uptime)
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