diff --git a/1001S2E04_control_flow.py b/1001S2E04_control_flow.py
new file mode 100644
index 000000000..b7abcebc4
--- /dev/null
+++ b/1001S2E04_control_flow.py
@@ -0,0 +1,19 @@
+
+print('打印九九乘法表')
+for i in range(1,10):
+    # print('第%d行' % i, end='\t')
+    for j in range(1, i + 1):
+        print(i, '*', j, '=', i * j, end='\t')
+        #print('{} * {} = {}'.format(i, j, i * j), end='\t')
+        print()
+
+        print('\n打印跳过偶数行的九九乘法表')
+        i = 1
+        while i < 10:
+            if i % 2== 0:
+                print()
+            else:
+                for j in range(1, i + 1):
+                     print(i, '*', j, '=', i * j, end='\t')
+                # print('{} * {} = {}'.format(i, j, i * j), end='\t')
+                i += 1
\ No newline at end of file
diff --git a/1901100102/1001S02E02_hello_python.py b/1901100102/1001S02E02_hello_python.py
new file mode 100644
index 000000000..00950d9ac
--- /dev/null
+++ b/1901100102/1001S02E02_hello_python.py
@@ -0,0 +1 @@
+print('hello world')
\ No newline at end of file
diff --git a/1901100102/1001S02E03_calculator.py b/1901100102/1001S02E03_calculator.py
new file mode 100644
index 000000000..4da1b46b3
--- /dev/null
+++ b/1901100102/1001S02E03_calculator.py
@@ -0,0 +1,43 @@
+
+# 这是单行注释
+
+'''
+这是
+多行注释
+注释的作用只是方便我们理解代码，并不参与执行
+'''
+
+"""
+这也是
+多行注释
+"""
+
+# 计算器确定输入三个值，分别是运算值，运算符左边的数字和运算符右边的数字
+
+# 把内置函数 input 接收的 输入字符 赋值 给 变量
+operator = input('请输入运算符（+、-、*、/）：')# input 里面的字符串的作用是在等待输入的时候进行提示
+first_number = input('请输入第一个数字：')
+second_number = input('请输入第二个数字：')
+
+a = int(first_number) # int(first_number) 在这里的作用是 把 str 类型 的 first_number 转换成 int 类型
+b = int(second_number)
+
+print('operator:',operator,type(operator) )
+print('firsr_number:',first_number,type(first_number),type(a))
+print('second_number:',second_number,type(second_number),type(b))
+
+print('测试加法 str 加法：',first_number + second_number)
+# print(测试加法 str 减法：', first_number - second_number)
+
+
+if operator == '+':
+    print(a, '+', b, '=', a + b)
+elif operator == '-':
+    print(a, '-', b, '=', a - b)
+elif operator == '*':
+     print(a, '*', b, '=', a * b)
+elif operator == '/':
+    print(a, '/', b, '=', a / b)
+else:
+    print('无效的运算符')
+    # raise ValueError('无效的运算符')
diff --git a/1901100102/README.md b/1901100102/README.md
new file mode 100644
index 000000000..e69de29bb