add exercise python file

Author: Chen Gao

python_exercises.py

@@ -0,0 +1,38 @@
+################# question 1 ###################
+def q1_div(x,y):
+    l=[]
+    for i in range(x,y):
+        if (i%7==0) and (i%5!=0):
+            l.append(str(i))
+    l_cont = ','.join(l)
+    print(type(l_cont),(l_cont))
+
+################# question 2 ###################
+def q2_factorial(x):
+    for i in range(x-1,1,-1):
+        x=x*i
+    print(x)
+def q2_factorial_s(x):
+    if x==0:
+        return 1
+    else:
+        return x*q2_factorial_s(x-1)
+
+################# question 3 ###################
+def q3_sqr(x):
+    d = {}
+    for i in range(1,x+1):
+        d[i]=i*i
+    return(d)
+
+################# question 4 ###################
+def q4_listtuple_s():
+    values=input()
+    l=values.split(",")
+    t=tuple(l)
+    print(l)
+    print(t)
+
+
+if __name__ == "__main__":
+    q4_listtuple_s()