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+.PHONY : CMakeFiles/helloworld.dir/clean
+
+CMakeFiles/helloworld.dir/depend:
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+# CMAKE generated file: DO NOT EDIT!
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+# CMAKE generated file: DO NOT EDIT!
+# Generated by "Unix Makefiles" Generator, CMake Version 3.14
+
+# Default target executed when no arguments are given to make.
+default_target: all
+
+.PHONY : default_target
+
+# Allow only one "make -f Makefile2" at a time, but pass parallelism.
+.NOTPARALLEL:
+
+
+#=============================================================================
+# Special targets provided by cmake.
+
+# Disable implicit rules so canonical targets will work.
+.SUFFIXES:
+
+
+# Remove some rules from gmake that .SUFFIXES does not remove.
+SUFFIXES =
+
+.SUFFIXES: .hpux_make_needs_suffix_list
+
+
+# Suppress display of executed commands.
+$(VERBOSE).SILENT:
+
+
+# A target that is always out of date.
+cmake_force:
+
+.PHONY : cmake_force
+
+#=============================================================================
+# Set environment variables for the build.
+
+# The shell in which to execute make rules.
+SHELL = /bin/sh
+
+# The CMake executable.
+CMAKE_COMMAND = /usr/bin/cmake3
+
+# The command to remove a file.
+RM = /usr/bin/cmake3 -E remove -f
+
+# Escaping for special characters.
+EQUALS = =
+
+# The top-level source directory on which CMake was run.
+CMAKE_SOURCE_DIR = /home/songxinkai/mytests/cmake/project0
+
+# The top-level build directory on which CMake was run.
+CMAKE_BINARY_DIR = /home/songxinkai/mytests/cmake/project0/build
+
+#=============================================================================
+# Targets provided globally by CMake.
+
+# Special rule for the target rebuild_cache
+rebuild_cache:
+	@$(CMAKE_COMMAND) -E cmake_echo_color --switch=$(COLOR) --cyan "Running CMake to regenerate build system..."
+	/usr/bin/cmake3 -S$(CMAKE_SOURCE_DIR) -B$(CMAKE_BINARY_DIR)
+.PHONY : rebuild_cache
+
+# Special rule for the target rebuild_cache
+rebuild_cache/fast: rebuild_cache
+
+.PHONY : rebuild_cache/fast
+
+# Special rule for the target edit_cache
+edit_cache:
+	@$(CMAKE_COMMAND) -E cmake_echo_color --switch=$(COLOR) --cyan "Running CMake cache editor..."
+	/usr/bin/ccmake3 -S$(CMAKE_SOURCE_DIR) -B$(CMAKE_BINARY_DIR)
+.PHONY : edit_cache
+
+# Special rule for the target edit_cache
+edit_cache/fast: edit_cache
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+#=============================================================================
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+
+# fast build rule for target.
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+.PHONY : helloworld/fast
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+
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+# target to generate assembly for a file
+main.cpp.s:
+	$(MAKE) -f CMakeFiles/helloworld.dir/build.make CMakeFiles/helloworld.dir/main.cpp.s
+.PHONY : main.cpp.s
+
+# Help Target
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+	@echo "The following are some of the valid targets for this Makefile:"
+	@echo "... all (the default if no target is provided)"
+	@echo "... clean"
+	@echo "... depend"
+	@echo "... rebuild_cache"
+	@echo "... edit_cache"
+	@echo "... helloworld"
+	@echo "... main.o"
+	@echo "... main.i"
+	@echo "... main.s"
+.PHONY : help
+
+
+
+#=============================================================================
+# Special targets to cleanup operation of make.
+
+# Special rule to run CMake to check the build system integrity.
+# No rule that depends on this can have commands that come from listfiles
+# because they might be regenerated.
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+.PHONY : cmake_check_build_system
+

cmake/project0/build/cmake_install.cmake

+# Install script for directory: /home/songxinkai/mytests/cmake/project0
+
+# Set the install prefix
+if(NOT DEFINED CMAKE_INSTALL_PREFIX)
+  set(CMAKE_INSTALL_PREFIX "/usr/local")
+endif()
+string(REGEX REPLACE "/$" "" CMAKE_INSTALL_PREFIX "${CMAKE_INSTALL_PREFIX}")
+
+# Set the install configuration name.
+if(NOT DEFINED CMAKE_INSTALL_CONFIG_NAME)
+  if(BUILD_TYPE)
+    string(REGEX REPLACE "^[^A-Za-z0-9_]+" ""
+           CMAKE_INSTALL_CONFIG_NAME "${BUILD_TYPE}")
+  else()
+    set(CMAKE_INSTALL_CONFIG_NAME "")
+  endif()
+  message(STATUS "Install configuration: \"${CMAKE_INSTALL_CONFIG_NAME}\"")
+endif()
+
+# Set the component getting installed.
+if(NOT CMAKE_INSTALL_COMPONENT)
+  if(COMPONENT)
+    message(STATUS "Install component: \"${COMPONENT}\"")
+    set(CMAKE_INSTALL_COMPONENT "${COMPONENT}")
+  else()
+    set(CMAKE_INSTALL_COMPONENT)
+  endif()
+endif()
+
+# Install shared libraries without execute permission?
+if(NOT DEFINED CMAKE_INSTALL_SO_NO_EXE)
+  set(CMAKE_INSTALL_SO_NO_EXE "0")
+endif()
+
+# Is this installation the result of a crosscompile?
+if(NOT DEFINED CMAKE_CROSSCOMPILING)
+  set(CMAKE_CROSSCOMPILING "FALSE")
+endif()
+
+if(CMAKE_INSTALL_COMPONENT)
+  set(CMAKE_INSTALL_MANIFEST "install_manifest_${CMAKE_INSTALL_COMPONENT}.txt")
+else()
+  set(CMAKE_INSTALL_MANIFEST "install_manifest.txt")
+endif()
+
+string(REPLACE ";" "\n" CMAKE_INSTALL_MANIFEST_CONTENT
+       "${CMAKE_INSTALL_MANIFEST_FILES}")
+file(WRITE "/home/songxinkai/mytests/cmake/project0/build/${CMAKE_INSTALL_MANIFEST}"
+     "${CMAKE_INSTALL_MANIFEST_CONTENT}")

cmake/project0/main.cpp

+#include <iostream>
+
+using namespace std;
+
+int main(){
+  cout << "hello world!" << endl;
+  return 0;
+}

python/decorator/test0.py

+#!/home/songxinkai/anaconda3/bin/python
+def func0(input_func):
+    def output_func():
+        print ("func 0 start")
+        input_func()
+        print ("func 0 finish")
+    return output_func
+
+def func1(input_func):
+    def output_func():
+        print ("func 1 start")
+        input_func()
+        print ("func 1 finish")
+    return output_func
+
+def func2(input_func):
+    def output_func():
+        print ("func 2 start")
+        input_func()
+        print ("func 2 finish")
+    return output_func
+
+def func3():
+    print ("func 3")
+
+@func0
+@func1
+@func2
+def func4():
+    print ("func 4")
+
+if __name__ == "__main__":
+    func5 = func0(func1(func2(func3)))
+    print ("*"*20)
+    func5()
+    print ("*"*20)
+    func4()
+    print ("*"*20)

python/generator/test1.py

+#!/home/songxinkai/anaconda3/bin/python
+from collections import Iterator
+from collections import Iterable
+from datetime import datetime
+def LIST(n):
+    for i in range(n):
+        yield i
+
+if __name__ == "__main__":
+    N = 10
+    l = [x for x in range(N)]
+    print ("Allocate list done.")
+    # for x in l:
+    #     print ("list: ", x)
+    g = (x for x in range(N))
+    print ("Allocate generator done.")
+    # for x in g:
+    #     print ("generator: ", x)
+    L = LIST(N)
+    print (L.__next__())
+    print (next(L))
+    l = list(L)
+    print (len(l))
+    print ("Allocate generator 2 done.")
+    # for x in L:
+    #     print ("generator 2: ", x)
+    print (isinstance(l, Iterable))
+    print (isinstance(g, Iterable))
+    print (isinstance(L, Iterable))
+    print (isinstance(iter(l), Iterable))
+
+    print (isinstance(l, Iterator))
+    print (isinstance(g, Iterator))
+    print (isinstance(L, Iterator))
+    print (isinstance(iter(l), Iterator))
+    for i in range(1000000000):
+        if i % 1000000 == 0:
+            print (i, end="\r")
+            print (i, end=" ")
+