diff --git a/exercises/1901100251/1001S02E02_hello_python.py b/exercises/1901100251/1001S02E02_hello_python.py
index 75d9766db..9c70d9b1e 100644
--- a/exercises/1901100251/1001S02E02_hello_python.py
+++ b/exercises/1901100251/1001S02E02_hello_python.py
@@ -1 +1 @@
-print('hello world')
+print ("hello world!")
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diff --git a/exercises/1901100251/1001S02E03_calculator.py b/exercises/1901100251/1001S02E03_calculator.py
new file mode 100644
index 000000000..3fcca9b13
--- /dev/null
+++ b/exercises/1901100251/1001S02E03_calculator.py
@@ -0,0 +1,27 @@
+print('===================自制计算器====================')
+a = float(input('请输入第一个数字:'))
+b = input('请输入运算符(+,-,*,/):')
+c = float(input('请输入第二个数字:'))
+add = a + c
+#减法
+sub = a - c
+#乘法
+times = a * c
+#除法
+division = a / c
+
+print('====================输出结果=====================')
+if b == '+':
+    print('您输入的加法运算结果为: %f'%add)
+
+elif b == '-':
+    print('您输入的减法运算结果为: %f'%sub)
+
+elif b == '*':
+    print('您输入的乘法运算结果为: %f'%times)
+
+elif b == '/':
+    print('您输入的除法运算结果为: %f'%division)
+else :
+    print('您输入的运算符有误！')
+print('================================================')
diff --git a/exercises/1901100251/1001S02E04_control_flow.py b/exercises/1901100251/1001S02E04_control_flow.py
new file mode 100644
index 000000000..636ee11e1
--- /dev/null
+++ b/exercises/1901100251/1001S02E04_control_flow.py
@@ -0,0 +1,23 @@
+#使⽤for...in循环打印九九乘法表
+for a in range (1,10):
+    for b in range (1,10):
+        print (a,"x",b, "=",a*b,"\t", end= "")
+        if a == b:
+            print ("")
+            break
+
+
+
+
+
+
+#使用while循环打印九九乘法表并⽤条件判断把偶数行去除掉
+for a in range (1,10):
+    for b in range (1,10):
+        while a % 2 == 0:
+            break
+        else:
+            print(a,"x",b,"=",a*b,"\t", end="")
+            if a == b:
+                print ("")
+                break
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