提提交

day2/README.md

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+## 简并
+### 'a/=2'   ==   'a=a/2'
+## 切片
+### x[a:b:c]中c代表距 默认是1

day2/条件循环.py

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+"""a = input("数：")
+num = int(a)
+if num % 2 == 0:
+    print(num * 2)
+else:
+    print(num + 1)
+
+while num >= 2:
+    num /= 2
+print(num)
+
+sb = range(114,514)
+for i in sb :
+    print(i)"""
+
+"""
+a =input("")
+b= ''
+for i in a:
+    b = i + b#从右边倒着加字符
+print(b)
+"""
+str = input("")
+length = len(str)
+num = 0
+shot = ""
+for i in range(0, length):
+    num = length - i - 1
+    shot += str[num]
+print(shot)
+# for i in 0,3 为什么i会输出1和3
+"""
+str = '123'
+print(str[3])为什么会超范围
+"""