在计算机科学中,Token通常是指由一个或多个字符组成的字符串,可以表示某些语言的基本单元
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在计算机科学中,Token通常是指由一个或多个字符组成的字符串,可以表示某些语言的基本单元。在 Python 中,生成 Token 通常指将输入的源代码转换为一系列标识符、关键字、运算符等等,方便后续的解析和执行。
在 Python 中,可以通过使用内置的 tokenize 模块来生成 Token。该模块提供了一个 tokenize 函数,可以读取 Python 源代码并将其分割成一系列 Token。例如,在以下示例代码中:
python
import io
import tokenize
source_code = """
def foo(x, y):
z = x + y
return z
"""
tokens = tokenize.tokenize(io.BytesIO(source_code.encode('utf-8')).readline)
for token in tokens:
print(token)
上述示例代码定义了一个名为 source_code 的变量,其中包含了一个简单的函数定义。接下来,我们调用 tokenize.tokenize 函数,并将其传递给一个被称为生成器(generator)的对象来逐个迭代 Token。最后,我们将每个 Token 打印到控制台上。
输出结果如下所示:
TokenInfo(type=57 (ENCODING), string='utf-8', start=(0, 0), end=(0, 0), line='')
TokenInfo(type=1 (NAME), string='def', start=(2, 0), end=(2, 3), line='def foo(x, y):\n')
TokenInfo(type=1 (NAME), string='foo', start=(2, 4), end=(2, 7), line='def foo(x, y):\n')
TokenInfo(type=53 (OP), string='(', start=(2, 7), end=(2, 8), line='def foo(x, y):\n')
TokenInfo(type=1 (NAME), string='x', start=(2, 8), end=(2, 9), line='def foo(x, y):\n')
TokenInfo(type=53 (OP), string=',', start=(2, 9), end=(2, 10), line='def foo(x, y):\n')
TokenInfo(type=1 (NAME), string='y', start=(2, 11), end=(2, 12), line='def foo(x, y):\n')
TokenInfo(type=53 (OP), string=')', start=(2, 12), end=(2, 13), line='def foo(x, y):\n')
TokenInfo(type=53 (OP), string=':', start=(2, 13), end=(2, 14), line='def foo(x, y):\n')
TokenInfo(type=4 (NEWLINE), string='\n', start=(2, 14), end=(2, 15), line='def foo(x, y):\n')
TokenInfo(type=5 (INDENT), string=' ', start=(3, 0), end=(3, 4), line=' z = x + y\n')
TokenInfo(type=1 (NAME), string='z', start=(3, 4), end=(3, 5), line=' z = x + y\n')
TokenInfo(type=53 (OP), string='=', start=(3, 6), end=(3, 7), line=' z = x + y\n')
TokenInfo(type=1 (NAME), string='x', start=(3, 8), end=(3, 9), line=' z = x + y\n')
TokenInfo(type=53 (OP), string='+', start=(3, 10), end=(3, 11), line=' z = x + y\n')
TokenInfo(type=1 (NAME), string='y', start=(3, 12), end=(3, 13), line=' z = x + y\n')
TokenInfo(type=4 (NEWLINE), string='\n', start=(3, 13), end=(3, 14), line=' z = x + y\n')
TokenInfo(type=1 (NAME), string='return', start=(4, 4), end=(4, 10), line=' return z\n')
TokenInfo(type=1 (NAME), string='z', start=(4, 11), end=(4, 12), line=' return z\n')
TokenInfo(type=4 (NEWLINE), string='\n', start=(4, 12), end=(4, 13), line=' return
在计算机科学中,Token通常是指由一个或多个字符组成的字符串,可以表示某些语言的基本单元。在 Python 中,生成 Token 通常指将输入的源代码转换为一系列标识符、关键字、运算符等等,方便后续的解析和执行。
在 Python 中,可以通过使用内置的 tokenize 模块来生成 Token。该模块提供了一个 tokenize 函数,可以读取 Python 源代码并将其分割成一系列 Token。例如,在以下示例代码中:
python
import io
import tokenize
source_code = """
def foo(x, y):
z = x + y
return z
"""
tokens = tokenize.tokenize(io.BytesIO(source_code.encode('utf-8')).readline)
for token in tokens:
print(token)
上述示例代码定义了一个名为 source_code 的变量,其中包含了一个简单的函数定义。接下来,我们调用 tokenize.tokenize 函数,并将其传递给一个被称为生成器(generator)的对象来逐个迭代 Token。最后,我们将每个 Token 打印到控制台上。
输出结果如下所示:
TokenInfo(type=57 (ENCODING), string='utf-8', start=(0, 0), end=(0, 0), line='')
TokenInfo(type=1 (NAME), string='def', start=(2, 0), end=(2, 3), line='def foo(x, y):\n')
TokenInfo(type=1 (NAME), string='foo', start=(2, 4), end=(2, 7), line='def foo(x, y):\n')
TokenInfo(type=53 (OP), string='(', start=(2, 7), end=(2, 8), line='def foo(x, y):\n')
TokenInfo(type=1 (NAME), string='x', start=(2, 8), end=(2, 9), line='def foo(x, y):\n')
TokenInfo(type=53 (OP), string=',', start=(2, 9), end=(2, 10), line='def foo(x, y):\n')
TokenInfo(type=1 (NAME), string='y', start=(2, 11), end=(2, 12), line='def foo(x, y):\n')
TokenInfo(type=53 (OP), string=')', start=(2, 12), end=(2, 13), line='def foo(x, y):\n')
TokenInfo(type=53 (OP), string=':', start=(2, 13), end=(2, 14), line='def foo(x, y):\n')
TokenInfo(type=4 (NEWLINE), string='\n', start=(2, 14), end=(2, 15), line='def foo(x, y):\n')
TokenInfo(type=5 (INDENT), string=' ', start=(3, 0), end=(3, 4), line=' z = x + y\n')
TokenInfo(type=1 (NAME), string='z', start=(3, 4), end=(3, 5), line=' z = x + y\n')
TokenInfo(type=53 (OP), string='=', start=(3, 6), end=(3, 7), line=' z = x + y\n')
TokenInfo(type=1 (NAME), string='x', start=(3, 8), end=(3, 9), line=' z = x + y\n')
TokenInfo(type=53 (OP), string='+', start=(3, 10), end=(3, 11), line=' z = x + y\n')
TokenInfo(type=1 (NAME), string='y', start=(3, 12), end=(3, 13), line=' z = x + y\n')
TokenInfo(type=4 (NEWLINE), string='\n', start=(3, 13), end=(3, 14), line=' z = x + y\n')
TokenInfo(type=1 (NAME), string='return', start=(4, 4), end=(4, 10), line=' return z\n')
TokenInfo(type=1 (NAME), string='z', start=(4, 11), end=(4, 12), line=' return z\n')
TokenInfo(type=4 (NEWLINE), string='\n', start=(4, 12), end=(4, 13), line=' return
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