自学训练营学习18群 Day4

1901100207/1001S02E02_hello_python.py

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+print('hello world')

1901100207/1001S02E03_calculator.py

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+operator=input('请输入运算符(+、-、*、/):') 
+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)
+b=int(second_number)
+print('operator:',operator,type(operator))
+print('first_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)
+if operator=='+':
+    print(a,'+',b,'=',a+b)
+else operator=='-':
+    print(a,'-',b,'=',a-b)
+else operator=='*':
+    print(a,'*',b,'=',a*b)
+else operator=='/':
+    print(a,'/',b,'=',a/b)
+else:
+    print('无效的运算符')

1901100207/1001S02E04_control_flow.py

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+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