第一步,导入NLTK 开始使用Python之前,先确保安装了NLTK模块。在命令行上,通过运行以下命令检查NLTK: $ python -c "import nltk" 如果已安装NLTK,那么这个命令将完成且没有错误。现在,让我们确保您安装了最新版本: $ python -c "import nltk; print(nltk.__version__)" 您应该安装版本3.2.1,因为我们将使用需...
list, for-loop, range 练习代码: 练习1 the_count = [1, 2, 3, 4, 5]#this first kind of for-loop goes through a listfornumberinthe_count:print('This is count %d'% number) 结果: This is count 1 This is count 2 This is count 3 This is count 4 This is count 5 练习2 fruits ...
'pennies',2,'dimes',3,'quarters']45# this first kind of for-loop goes through a list6fornumberinthe_count:7print(f"This is count {number}")89# same as above10forfruitinfruits:11print(f"A fruit of type: {fruit}")1213# also we can go through mixed lists too14foriinchange...
3, 'quarters']45 # this first kind of for-loop goes through a list6 for number in the_count:7 print(f"This is count {number}")89 # same as above10 for fruit in fruits:11 print(f"A fruit of type: {fruit}")1213 # also we can go through mixed lists too14 for i in change:...
the_count = [1, 2, 3, 4, 5] fruits = ['apples', 'oranges', 'pears', 'apricots'] change = [1, 'pennies', 2, 'dimes', 3, 'quarters'] # this first kind of for-loop goes through a list for number in the_count: print ("This is count %d" % number) # same as above ...
# Loop through list of tweets for tweet in tweets_tagged: for pair in tweet: tag = pair[1] if tag == 'JJ': JJ_count += 1 elif tag == 'NN': NN_count += 1 # Print total numbers for each adjectives and nouns print('Total number of adjectives = ', JJ_count) ...
Let us go through the loop control statements briefly. Iterator and Generator Iteratoris an object which allows a programmer to traverse through all the elements of a collection, regardless of its specific implementation. In Python, an iterator object implements two methods,iter()andnext(). ...
Loop through numbers Check divisibility Collect Results Add divisible number Return list to User Find Divisible Numbers Journey 6. 结论 通过以上示例,我们实现了一个有趣且实用的功能,即查找能被3整除或能被5整除的数字。这个例子不仅展示了基本的循环和条件判断的用法,还通过图示化工具帮助我们理解了代码执行...
Wenowreachthepartwhereyou’rereadytotrythis.First,readthroughthetestandstudywhatitdoes, andstudythecodeinsllist.pytofigureoutwhatyouneedtodo.Isuggestthatwhenyouattempt toimplementafunctioninSingleLinkedListyoufirstwritethecommentsdescribingwhatitdoes, thenfillinthePythoncodetomakethosecommentswork.You’...
修改list的值 我们可以通过index来改变list的值: beta_list=[“apple”,“banana”,“orange”]beta_list[1]=“pear”print(beta_list) 输出: [‘apple’,‘pear’,‘cherry’] list遍历 我们使用for loop来进行list的遍历: forxinrange(1,4):beta_list+=[‘fruit’]print(beta_list) ...