read_csv( 'large.csv', chunksize=chunksize, dtype=dtype_map ) # # 然后每个chunk进行一些压缩内存的操作,比如全都转成sparse类型 # string类型比如,学历,可以转化成sparse的category变量,可以省很多内存 sdf = pd.concat( chunk.to_sparse(fill_value=0.0) for
In Python, astringis a sequence of characters. A multi-line string is a string that spans across multiple lines of code. Multi-line strings can be created using either triple quotes or escape characters. Triple quotes are either single quotes (''') or double quotes (""") that allow you...
fabmp:srvfab$# step 1 - create folderfabmp:srvfab$mkdirlearn.ppfabmp:srvfab$cdlearn.ppfabmp:learn.ppfab$# step 2 - create virtual environmentfabmp:learn.ppfab$whichpython3.7/Users/fab/.pyenv/shims/python3.7fabmp:learn.ppfab$virtualenv-p⇢/Users/fab/.pyenv/shims/python3.7learnppRunningvi...
string.endswith() Returns True if a string ends with the specified suffix (case-sensitive), otherwise returns False. string.expandtabs() Returns a string with all tab characters \t replaced with one or more space, depending on the number of characters before \t and the specified tab size. ...
Gooey - Turn command line programs into a full GUI application with one line. kivy - A library for creating NUI applications, running on Windows, Linux, Mac OS X, Android and iOS. pyglet - A cross-platform windowing and multimedia library for Python. PyGObject - Python Bindings for GLib/G...
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$ python multiple.sequences.py Conrad29Deepak30Heinrich34Tom36 这段代码既低效又不符合 Python 的风格。它是低效的,因为根据位置检索元素可能是一个昂贵的操作,并且我们在每次迭代时都是从头开始做这个操作。邮递员在递送信件时不会每次都回到路的起点,对吧?他们是从一户到另一户。让我们尝试使用enumerate来改...
从dict继承的__init__方法明显忽略了__setitem__的重写:'one'的值没有复制。 ③ []操作符调用我们的__setitem__,并按预期工作:'two'映射到重复的值[2, 2]。 ④ dict的update方法也没有使用我们的__setitem__版本:'three'的值没有被复制。 这种内置行为违反了面向对象编程的一个基本规则:方法的搜索应始...
从dict继承的__init__方法明显忽略了__setitem__的重写:'one'的值没有复制。③[]操作符调用我们的__setitem__,并按预期工作:'two'映射到重复的值[2, 2]。④dict的update方法也没有使用我们的__setitem__版本:'three'的值没有被复制。这种内置行为违反了面向对象编程的一个基本规则:方法的搜索应始终从...
In python strings are a strings that contains several lines, rather than just one line. There are several ways to create a multiline string in python. Python provides a wide variety of ways to format strings to your liking. How do you read a multiline string in Python? Reading multi-line...