Python – 替换字典中的单词

给定字符串，从查找字典中替换它的单词。

Input : test_str = ‘geekforgeeks best for geeks’, repl_dict = {“geeks” : “all CS aspirants”}
Output : geekforgeeks best for all CS aspirants
Explanation : “geeks” word is replaced by lookup value.

Input : test_str = ‘geekforgeeks best for geeks’, repl_dict = {“good” : “all CS aspirants”}
Output : geekforgeeks best for geeks
Explanation : No lookup value, unchanged result.

方法#1：使用 split() + get() + join()

在此，我们最初使用 split() 拆分列表，然后使用 get() 查找查找，如果找到，则使用 join() 替换并连接回字符串。

Python3

# Python3 code to demonstrate working of 
# Replace words from Dictionary
# Using split() + join() + get()
  
# initializing string
test_str = 'geekforgeeks best for geeks'
  
# printing original string
print("The original string is : " + str(test_str))
  
# lookup Dictionary
lookp_dict = {"best" : "good and better", "geeks" : "all CS aspirants"}
  
# performing split()
temp = test_str.split()
res = []
for wrd in temp:
      
    # searching from lookp_dict
    res.append(lookp_dict.get(wrd, wrd))
      
res = ' '.join(res)
  
# printing result 
print("Replaced Strings : " + str(res))

输出

The original string is : geekforgeeks best for geeks
Replaced Strings : geekforgeeks good and better for all CS aspirants

方法 #2：使用列表理解 + join()

与上述方法类似，区别只是 1 行而不是 3-4 步在单独的行中。

Python3

# Python3 code to demonstrate working of 
# Replace words from Dictionary
# Using list comprehension + join()
  
# initializing string
test_str = 'geekforgeeks best for geeks'
  
# printing original string
print("The original string is : " + str(test_str))
  
# lookup Dictionary
lookp_dict = {"best" : "good and better", "geeks" : "all CS aspirants"}
  
# one-liner to solve problem
res = " ".join(lookp_dict.get(ele, ele) for ele in test_str.split())
  
# printing result 
print("Replaced Strings : " + str(res)) 

输出

The original string is : geekforgeeks best for geeks
Replaced Strings : geekforgeeks good and better for all CS aspirants