map reduce

Author: CoderHuo

studyLib/functional/map_reduce.py

@@ -2,6 +2,7 @@
 # -*- coding: utf-8 -*-
 
 from functools import reduce
+import re
 
 __author__ = 'Mr.Huo'
 
@@ -22,6 +23,10 @@ def statistics(dic, k):
     return dic
 
 
+def str2int(x, y):
+    return x * 10 + y
+
+
 def main():
     # python map()函数,接收两个参数函数、Iterable，map将传入的函数依次作用到序列的每个元素，并把结果作为新的Iterator返回
     list1 = [x for x in range(1, 12)]
@@ -48,6 +53,20 @@ def main():
     redu4 = reduce(statistics, list2, {})
     print(redu4)
 
+    # 将字符串的首字母大写，其他的小写
+    names = ['adam', 'LISA', 'barT']
+    b = lambda x: x[0].upper() + x[1:].lower()
+    print(b(names[2]))
+    new_names = list(map(lambda x: x[0].upper() + x[1:].lower(), names))
+    print(new_names)
+
+    # 将数字字符串转换成一个数
+    num_str = '1003750'
+    num = reduce(lambda x, y: x * 10 + y, map(int, num_str))
+    print(num, type(num))
+    num1 = reduce(lambda x, y: x / 10 + y, map(int, num_str[::-1]))
+    print(num1, type(num1))
+
 
 if __name__ == '__main__':
     main()