Initial commit: Python learning project with examples and exercises

python代码/7.1.2.py

@@ -0,0 +1,45 @@
+#7.1.2
+def r(filename):    #获取数据
+    with open(filename, 'r') as f:
+        return list(map(float, f.read().split()))
+
+def a(x):    #平均值
+    average_x = sum(x)/len(x)
+    return "平均值:{:.0f}".format(average_x)
+
+def f(x):    #标准差
+    import numpy
+    list2_f = numpy.var(x)  #numpy库的标准差公式
+    return "标准差:{:.0f}".format(list2_f)
+
+def z(x):    #中位数
+    y = x
+    length = len(y)
+    sorted_nums = sorted(y)
+    mid = length // 2
+
+    if length % 2:
+        result = sorted_nums[mid]
+    else:
+        left = sorted_nums[mid - 1]
+        right = sorted_nums[mid]
+        result = (left + right) / 2
+    return f"中位数:{round(result)}"
+
+
+nums = r('nums.txt')    #文件地址
+print(nums)
+nums_p = a(nums)
+print(nums_p)
+nums_b = f(nums)
+print(nums_b)
+nums_z = z(nums)
+print(nums_z)
+
+
+with open('new_nums.txt', 'w', encoding='utf-8') as new_nums:
+    new_nums.write(nums_p + "\n")
+    new_nums.write(nums_b + "\n")
+    new_nums.write(nums_z + "\n")
+    sorted_str = "排序后:" + " ".join(map(str, sorted(nums)))
+    new_nums.write(sorted_str + "\n")