1.files in /proc are not actual files, they're an interface to lower-levels of the operating system.

2.the usual way of updating things in proc is directly with a shell command。
	echo 0 > /proc/sys/kernel/yama/ptrace_scope

3.If you want this setting to be applied every time you boot, edit /etc/sysctl.d/10-ptrace.conf
	kernel.yama.ptrace_scope = 0
	apply your change
		sysctl -p /etc/sysctl.d/10-ptrace.conf