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這篇文章將為大家詳細(xì)講解有關(guān)Python傳遞列表的方法,小編覺得挺實(shí)用的,因此分享給大家做個(gè)參考,希望大家閱讀完這篇文章后可以有所收獲。
傳遞列表
def greet_users(names): for name in names: mag = "Hello, " + name.title() + "!" print(mag) user_names = ['hannah', 'bob', 'margot'] greet_users(user_names)
運(yùn)行結(jié)果:
Hello, Hannah! Hello, Bob! Hello, Margot!
1. 在函數(shù)中修改列表
# 創(chuàng)建一個(gè)列表,其中包含一些要打印的設(shè)計(jì) unprinted_designs = ['iphone case', 'robot pendant', 'dodecahedron'] completed_models = [] # 模擬打印每個(gè)設(shè)計(jì),直到?jīng)]有未打印的設(shè)計(jì)為止,打印后移至completed_models中 while unprinted_designs: current_design = unprinted_designs.pop() # 模擬根據(jù)設(shè)計(jì)制作打印模型的過程 print("Printing model: " + current_design) completed_models.append(current_design) # 顯示打印好的模型 print("\nThe following models have been printed:") print(completed_models)
運(yùn)行結(jié)果:
Printing model: dodecahedron Printing model: robot pendant Printing model: iphone case The following models have been printed: ['dodecahedron', 'robot pendant', 'iphone case']
用函數(shù)如何表達(dá)上述代碼的意思呢?
def print_models(unprinted_designs, completed_models): while unprinted_designs: current_design = unprinted_designs.pop() print("Printing model: " + current_design) completed_models.append(current_design) def show_completed_models(completed_models): print("\nThe following models have been printed:") for completed_model in completed_models: print(completed_model) unprinted_designs = ['iphone case', 'robot pendant', 'dodecahedron'] completed_models = [] print_models(unprinted_designs, completed_models) show_completed_models(completed_models)
當(dāng)print_models函數(shù)調(diào)用之后,列表completed_models已經(jīng)不是最初定義的空,所有列表unprinted_designs中的元素已轉(zhuǎn)移至列表completed_models,接下來調(diào)用show_completed_models函數(shù)就將列表completed_models中的元素都打印出來。
2. 禁止函數(shù)修改列表
上述的例子中print_models函數(shù)調(diào)用之后,列表unprinted_designs中的元素均已移除,此時(shí)的列表為空。但若想保留列表中的元素呢?
print_models(unprinted_designs[:], completed_models)
用切片法 [ : ] 創(chuàng)建列表副本,函數(shù)調(diào)用時(shí)使用的是列表的副本,而不是列表本身,此時(shí)函數(shù)中對列表做的修改不會(huì)影響到列表unprinted_designs。
關(guān)于Python傳遞列表的方法就分享到這里了,希望以上內(nèi)容可以對大家有一定的幫助,可以學(xué)到更多知識(shí)。如果覺得文章不錯(cuò),可以把它分享出去讓更多的人看到。
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