自学营19群+1901100275+Day4

exercises/1901100275/1001S02E01_helloworld.txt

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exercises/1901100275/1001S02E02_hello_python.py

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+print('Hello World')

exercises/1901100275/1001S02E03_calculator.py

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+operator=input
+first_number=input
+second_number=input
+a=int(first_number)
+b=int(second_number)
+print("operator:",operator,type(operator))
+print("first_number:",first_number,type(first_number))
+print("second_number:",second_number,type(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')

exercises/1901100275/1001S02E04_control_flow.py

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+i=0
+while i <9:
+    i+=1
+    a=0
+    while a <9:
+        a+=1
+        if int(i)%2!=0:
+            print('%d*%d=%d'%(i,a,i*a),end=' ')
+            if i==a:
+                print('')
+                break
+
+
+for i in range(1,10):
+    for a in range(1,i+1):
+        print('%d*%d=%d'%(i,a,i*a),end=' ')
+        if i==a:
+            print('')
+            break