如何檢查列表項是否存在於另一個列表中

我想比較兩個列表（預期和實際）。我想檢查預期列表項目是否存在於實際列表項目中。我正在嘗試下面的示例代碼。我可以嘗試set(expected)-set(actual)。這會給我不同，但我想檢查項目是否存在，否則顯示哪些項目不存在。可以有人指導我，如何實現低於預期的結果或我正在做什麼錯誤。如果我是學習者，請忽略是否有錯誤。如何檢查列表項是否存在於另一個列表中

actual = ['resources.sh', 'server.properties', 'resources.csv', 'resources.log', 'sampleresources.csv'] 
    expected = ['resources.sh', 'server.properties', 'resources.csv', 'resources.log'] 
    for i in expected: 
     for b in actual: 
      if b.split(".")[0] in i: 
       print "{} is present".format(b) 
      else: 
       print "{} is not present".format(i)

實際結果：

resources.sh is present 
resources.sh is not present 
resources.csv is present 
resources.log is present 
resources.sh is not present 
server.properties is not present 
server.properties is present 
server.properties is not present 
server.properties is not present 
server.properties is not present 
resources.sh is present 
resources.csv is not present 
resources.csv is present 
resources.log is present 
resources.csv is not present 
resources.sh is present 
resources.log is not present 
resources.csv is present 
resources.log is present 
resources.log is not present

預期結果：

resources.sh is present 
server.properties is present 
resources.csv is present 
resources.log is present 
sampleresources.csv is not present

來源

2017-08-02 Madhu

你'set.intersection'後？ –

謝謝@JonClements。這是正確的做法嗎？如果len（set（expected）.intersection（set（actual）））> 0： print True else： print False ' – Madhu

你可以使用列表comrehension有一個更乾淨的代碼：

actual = ['resources.sh', 'server.properties', 'resources.csv', 'resources.log', 'sampleresources.csv'] 
    expected = ['resources.sh', 'server.properties', 'resources.csv', 'resources.log'] 

    def print_msg(x): 
     print(x,'is present') 

    [print_msg(b) for i in actual for b in expected if i == b]

來源

2017-08-02 18:34:20

你可以通過actual一次循環：

for i in actual: 
    if i in expected: 
     print(i, "is present") 
    else: 
     print(i, "is not present")

輸出：

resources.sh is present 
server.properties is present 
resources.csv is present 
resources.log is present 
sampleresources.csv is not present

來源

2017-08-02 18:27:59 Ajax1234

感謝您的回答 – Madhu

我很高興我可以提供幫助。 – Ajax1234

actual = ['resources.sh', 'server.properties', 'resources.csv','resources.log', 'sampleresources.csv'] 
expected = ['resources.sh', 'server.properties', 'resources.csv', 'resources.log'] 
for i in actual: 
    if i in expected:print "{} is present".format(i) 
    else:print "{} is not present".format(i)

輸出：

resources.sh is present 
server.properties is present 
resources.csv is present 
resources.log is present 
sampleresources.csv is not present

來源

2017-08-02 18:30:15

[print ("{} is present".format(b)) if b in expected 
else print("{} is not present".format(b)) for b in actual]

來源

2017-08-02 18:30:23 Mohamed

actual = ['resources.sh', 'server.properties', 'resources.csv', 'resources.log', 'sampleresources.csv'] 
expected = ['resources.sh', 'server.properties', 'resources.csv', 'resources.log'] 

result = [elem + ' is present' if elem in expected else elem + ' is not present' for elem in actual] 
print result

來源

2017-08-02 18:30:53

如何檢查列表項是否存在於另一個列表中

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