readline() 正在跳过源文件中的行
我有一个用多行创建的 .txt 文件。
当我使用计数累加器运行 for 循环时，它会跳过行。
它跳过顶行，从第二行开始，打印第四行、第六行等。
我错过了什么？
def main():
# Open file line_numbers.txt
data_file = open('line_numbers.txt', 'r')
# initialize accumulatior
count = 1
# Read all lines in data_file
for line in data_file:
# Get the data from the file
line = data_file.readline()
# Display data retrieved
print(count, ": ", line)
# add to count sequence
count += 1
I have a .txt file that I created with multiple lines.
When I run a for loop, with a count accumulator, it skips lines.
It skips the top line, and starts with the second, prints the fourth, the sixth, etc.
What is it I'm missing?
def main():
# Open file line_numbers.txt
data_file = open('line_numbers.txt', 'r')
# initialize accumulatior
count = 1
# Read all lines in data_file
for line in data_file:
# Get the data from the file
line = data_file.readline()
# Display data retrieved
print(count, ": ", line)
# add to count sequence
count += 1
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尝试完全删除“line=data_file.readline()”？我怀疑“for line in data_file:”也是一个 readline 操作。
Try removing the "line=data_file.readline()" altogether? I suspect the "for line in data_file:" is also a readline operation.
您的 for 循环正在迭代 data_file 并且您的 readline() 正在与之竞争。删除代码中的
line = data_file.readline()行以获得此结果：You for loop is iterating over the data_file and your readline() is competing with it. Erase the
line = data_file.readline()line of your code for this result:for line in data_file已经为您获取了每行的文本 - 随后对 readline 的调用将获取下面行。换句话说，删除对 readline 的调用将执行您想要的操作。同时，您不需要自己跟踪累加器变量 - python 有一个使用enumerate执行此操作的内置方法 - 换句话说：for line in data_filealready gets the text of each line for you - the subsequent call to readline then gets the following line. In other words, removing the call to readline will do what you want. At the same time, you don't need to keep track of an accumulator variable yourself - python has a built-in way of doing this usingenumerate- in other words: