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Methods of File ObjectsThe rest of the examples in this section will assume that a file object calledfhas already been created.To read a file’s contents, callf.read(size), which reads some quantity of data and returns it as a string or bytes object.sizeis an optional numeric argument. Whensizeis omi 阅读全文
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string的ljust()、rjust()、center()用来对齐>>> for x in range(1, 11):... print(repr(x).rjust(2), repr(x*x).rjust(3), end=' ')... # Note use of 'end' on previous line... print(repr(x*x*x).rjust(4))... 1 1 1 2 4 8 3 9 27 4 16 64 5 25 125 6 36 216 7 49 343 8 64 512 9 81 7... 阅读全文
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dir函数用来查看上下文dir()会列出当前上下文的所有变量、模块、函数等等，把得到的值再传给dir可以像下查看>>> import fibo, sys>>> dir(fibo)['__name__', 'fib', 'fib2']>>> dir(sys) ['__displayhook__', '__doc__', '__egginsert', '__excepthook__', '__loader__', &# 阅读全文
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>>> tel = {'jack': 4098, 'sape': 4139}>>> tel['guido'] = 4127>>> tel{'sape': 4139, 'guido': 4127, 'jack': 4098}>>> tel['jack']4098>>> del tel['sape']>>> tel['irv'] = 4127> 阅读全文
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Set包含不重复元素，用{}或者set()创建，有于或非等运算符>>> basket = {'apple', 'orange', 'apple', 'pear', 'orange', 'banana'}>>> print(basket) # show that duplicates have been removed{'orange', 'banana', 'pear', 'apple'}>&g 阅读全文
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定义函数>>> def fib(n): # write Fibonacci series up to n... """Print a Fibonacci series up to n."""... a, b = 0, 1... while a < n:... print(a, end=' ')... a, b = b, a+b... print()...>>> # Now call the function we just defined:... fib(2000)0 1 1 阅读全文