List 列表

Python
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lst = ['hello']
print(lst)

lst.append("world")
print(lst)
lst = ['hello']
print(lst)

lst.append("world")
print(lst)        
      

List Comprehensions

列表解析 (列表推导)

Python
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# [expression for iter_val in iterable if cond_expr]
lst = [i for i in range(10)]
print(lst)
# [expression for iter_val in iterable if cond_expr]
lst = [i for i in range(10)]
print(lst)        
      

列表解析可以快速构建列表（list）, 可以看下面的例子把一个字符串变成 Unicode 码位的列表，一般的方式就是for循环遍历

Python
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symbols = '$¢£¥€¤'
codes = []
for symbol in symbols:
    codes.append(ord(symbol))
print(codes)
symbols = '$¢£¥€¤'
codes = []
for symbol in symbols:
    codes.append(ord(symbol))
print(codes)        
      

而使用列表解析更简洁明了，也是更pythonic的写法

Python
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symbols = '$¢£¥€¤'
codes = [ord(symbol) for symbol in symbols]
print(codes)
symbols = '$¢£¥€¤'
codes = [ord(symbol) for symbol in symbols]
print(codes)        
      

List 列表 #

List Comprehensions #

List 列表

List Comprehensions