Python从公共FTP服务器下载zip文件

我需要从我的PC（windows OS）上的公共地理数据库的“C:\DEMDownload”文件夹中下载几个（数字地球模型）zip文件

当我在

ftp.retrbinary（'RETR%s'%file，open（local_file，'wb'）.write）行运行代码时，

我收到以下错误消息

Traceback (most recent call last):
  File "<input>", line 1, in <module>
  File "C:\Python27\lib\ftplib.py", line 414, in retrbinary
    conn = self.transfercmd(cmd, rest)
  File "C:\Python27\lib\ftplib.py", line 376, in transfercmd
    return self.ntransfercmd(cmd, rest)[0]
  File "C:\Python27\lib\ftplib.py", line 339, in ntransfercmd
    resp = self.sendcmd(cmd)
  File "C:\Python27\lib\ftplib.py", line 249, in sendcmd
    return self.getresp()
  File "C:\Python27\lib\ftplib.py", line 224, in getresp
    raise error_perm, resp
error_perm: 550 Failed to open file.

---

我可以通过以下方式成功下载具有给定url的zip文件：

# connect to ftp
url = urlparse.urlparse("http://ftp2.cits.rncan.gc.ca/pub/geobase/official/cded/50k_dem/")
ftp = ftplib.FTP(url.netloc)
ftp.login()
ftp.cwd(ftp_dirname)

with open(filename, 'w') as fobj:
    ftp.retrbinary('RETR %s' % basename, fobj.write)

通过遍历ftp目录，可以避免硬编码的目录/文件名，这与创造性地使用

完整代码如下：

url = 'http://ftp2.cits.rncan.gc.ca/pub/geobase/official/cded/50k_dem/'
url = urlparse.urlparse(url)

local_root = os.path.expanduser("~/ftp_download") # change this to wherever you want to download to

def download(ftp, ftp_path, filename, check_cwd=True):
    """
    Using the given ftp connection, download from ftp_path to 
    filename. 

    If check_cwd is False, assume the ftp connection is already 
    in the correct current working directory (cwd)
    """
    basename = posixpath.basename(ftp_path)
    dirname = os.path.dirname(filename)
    if not os.path.exists(dirname):
        os.makedirs(dirname)
    if check_cwd:
        ftp_dirname = posixpath.dirname(ftp_path)
        if ftp_dirname != ftp.pwd():
            ftp.cwd(ftp_dirname)

    with open(filename, 'w') as fobj:
        ftp.retrbinary('RETR %s' % basename, fobj.write)

def ftp_dir(ftp):
    """
    Given a valid ftp connection, get a list of 2-tuples of the
    files in the ftp current working directory, where the first
    element is whether the file is a directory and the second 
    element is the filename.
    """
    # use a callback to grab the ftp.dir() output in a list
    dir_listing = []
    ftp.dir(lambda x: dir_listing.append(x))
    return [(line[0].upper() == 'D', line.rsplit()[-1]) for line in dir_listing]

# connect to ftp
ftp = ftplib.FTP(url.netloc)
ftp.login()

# recursively walk through the directory and download each file, depth first
stack = [url.path]
while stack:
    path = stack.pop()
    ftp.cwd(path)

    # add all directories to the queue
    children = ftp_dir(ftp)
    dirs = [posixpath.join(path, child[1]) for child in children if child[0]]
    files = [posixpath.join(path, child[1]) for child in children if not child[0]] 
    stack.extend(dirs[::-1]) # add dirs reversed so they are popped out in order

    # download all files in the directory
    for filepath in files:
        download(ftp, filepath, os.path.join(local_root, filepath.split(url.path,1)[-1]), 
                                             check_cwd=False)

# logout
ftp.quit()

---

您可以通过使用一个python ftp包装库（如或）来进一步压缩此内容。我可以通过以下方式成功下载具有给定url的zip文件：

# connect to ftp
url = urlparse.urlparse("http://ftp2.cits.rncan.gc.ca/pub/geobase/official/cded/50k_dem/")
ftp = ftplib.FTP(url.netloc)
ftp.login()
ftp.cwd(ftp_dirname)

with open(filename, 'w') as fobj:
    ftp.retrbinary('RETR %s' % basename, fobj.write)

通过遍历ftp目录，可以避免硬编码的目录/文件名，这与创造性地使用

完整代码如下：

url = 'http://ftp2.cits.rncan.gc.ca/pub/geobase/official/cded/50k_dem/'
url = urlparse.urlparse(url)

local_root = os.path.expanduser("~/ftp_download") # change this to wherever you want to download to

def download(ftp, ftp_path, filename, check_cwd=True):
    """
    Using the given ftp connection, download from ftp_path to 
    filename. 

    If check_cwd is False, assume the ftp connection is already 
    in the correct current working directory (cwd)
    """
    basename = posixpath.basename(ftp_path)
    dirname = os.path.dirname(filename)
    if not os.path.exists(dirname):
        os.makedirs(dirname)
    if check_cwd:
        ftp_dirname = posixpath.dirname(ftp_path)
        if ftp_dirname != ftp.pwd():
            ftp.cwd(ftp_dirname)

    with open(filename, 'w') as fobj:
        ftp.retrbinary('RETR %s' % basename, fobj.write)

def ftp_dir(ftp):
    """
    Given a valid ftp connection, get a list of 2-tuples of the
    files in the ftp current working directory, where the first
    element is whether the file is a directory and the second 
    element is the filename.
    """
    # use a callback to grab the ftp.dir() output in a list
    dir_listing = []
    ftp.dir(lambda x: dir_listing.append(x))
    return [(line[0].upper() == 'D', line.rsplit()[-1]) for line in dir_listing]

# connect to ftp
ftp = ftplib.FTP(url.netloc)
ftp.login()

# recursively walk through the directory and download each file, depth first
stack = [url.path]
while stack:
    path = stack.pop()
    ftp.cwd(path)

    # add all directories to the queue
    children = ftp_dir(ftp)
    dirs = [posixpath.join(path, child[1]) for child in children if child[0]]
    files = [posixpath.join(path, child[1]) for child in children if not child[0]] 
    stack.extend(dirs[::-1]) # add dirs reversed so they are popped out in order

    # download all files in the directory
    for filepath in files:
        download(ftp, filepath, os.path.join(local_root, filepath.split(url.path,1)[-1]), 
                                             check_cwd=False)

# logout
ftp.quit()

---

您可以通过使用一个python ftp包装库（如或）来进一步压缩此内容。我可以通过以下方式成功下载具有给定url的zip文件：

# connect to ftp
url = urlparse.urlparse("http://ftp2.cits.rncan.gc.ca/pub/geobase/official/cded/50k_dem/")
ftp = ftplib.FTP(url.netloc)
ftp.login()
ftp.cwd(ftp_dirname)

with open(filename, 'w') as fobj:
    ftp.retrbinary('RETR %s' % basename, fobj.write)

通过遍历ftp目录，可以避免硬编码的目录/文件名，这与创造性地使用

完整代码如下：

url = 'http://ftp2.cits.rncan.gc.ca/pub/geobase/official/cded/50k_dem/'
url = urlparse.urlparse(url)

local_root = os.path.expanduser("~/ftp_download") # change this to wherever you want to download to

def download(ftp, ftp_path, filename, check_cwd=True):
    """
    Using the given ftp connection, download from ftp_path to 
    filename. 

    If check_cwd is False, assume the ftp connection is already 
    in the correct current working directory (cwd)
    """
    basename = posixpath.basename(ftp_path)
    dirname = os.path.dirname(filename)
    if not os.path.exists(dirname):
        os.makedirs(dirname)
    if check_cwd:
        ftp_dirname = posixpath.dirname(ftp_path)
        if ftp_dirname != ftp.pwd():
            ftp.cwd(ftp_dirname)

    with open(filename, 'w') as fobj:
        ftp.retrbinary('RETR %s' % basename, fobj.write)

def ftp_dir(ftp):
    """
    Given a valid ftp connection, get a list of 2-tuples of the
    files in the ftp current working directory, where the first
    element is whether the file is a directory and the second 
    element is the filename.
    """
    # use a callback to grab the ftp.dir() output in a list
    dir_listing = []
    ftp.dir(lambda x: dir_listing.append(x))
    return [(line[0].upper() == 'D', line.rsplit()[-1]) for line in dir_listing]

# connect to ftp
ftp = ftplib.FTP(url.netloc)
ftp.login()

# recursively walk through the directory and download each file, depth first
stack = [url.path]
while stack:
    path = stack.pop()
    ftp.cwd(path)

    # add all directories to the queue
    children = ftp_dir(ftp)
    dirs = [posixpath.join(path, child[1]) for child in children if child[0]]
    files = [posixpath.join(path, child[1]) for child in children if not child[0]] 
    stack.extend(dirs[::-1]) # add dirs reversed so they are popped out in order

    # download all files in the directory
    for filepath in files:
        download(ftp, filepath, os.path.join(local_root, filepath.split(url.path,1)[-1]), 
                                             check_cwd=False)

# logout
ftp.quit()

---

您可以通过使用一个python ftp包装库（如或）来进一步压缩此内容。我可以通过以下方式成功下载具有给定url的zip文件：

# connect to ftp
url = urlparse.urlparse("http://ftp2.cits.rncan.gc.ca/pub/geobase/official/cded/50k_dem/")
ftp = ftplib.FTP(url.netloc)
ftp.login()
ftp.cwd(ftp_dirname)

with open(filename, 'w') as fobj:
    ftp.retrbinary('RETR %s' % basename, fobj.write)

通过遍历ftp目录，可以避免硬编码的目录/文件名，这与创造性地使用

完整代码如下：

url = 'http://ftp2.cits.rncan.gc.ca/pub/geobase/official/cded/50k_dem/'
url = urlparse.urlparse(url)

local_root = os.path.expanduser("~/ftp_download") # change this to wherever you want to download to

def download(ftp, ftp_path, filename, check_cwd=True):
    """
    Using the given ftp connection, download from ftp_path to 
    filename. 

    If check_cwd is False, assume the ftp connection is already 
    in the correct current working directory (cwd)
    """
    basename = posixpath.basename(ftp_path)
    dirname = os.path.dirname(filename)
    if not os.path.exists(dirname):
        os.makedirs(dirname)
    if check_cwd:
        ftp_dirname = posixpath.dirname(ftp_path)
        if ftp_dirname != ftp.pwd():
            ftp.cwd(ftp_dirname)

    with open(filename, 'w') as fobj:
        ftp.retrbinary('RETR %s' % basename, fobj.write)

def ftp_dir(ftp):
    """
    Given a valid ftp connection, get a list of 2-tuples of the
    files in the ftp current working directory, where the first
    element is whether the file is a directory and the second 
    element is the filename.
    """
    # use a callback to grab the ftp.dir() output in a list
    dir_listing = []
    ftp.dir(lambda x: dir_listing.append(x))
    return [(line[0].upper() == 'D', line.rsplit()[-1]) for line in dir_listing]

# connect to ftp
ftp = ftplib.FTP(url.netloc)
ftp.login()

# recursively walk through the directory and download each file, depth first
stack = [url.path]
while stack:
    path = stack.pop()
    ftp.cwd(path)

    # add all directories to the queue
    children = ftp_dir(ftp)
    dirs = [posixpath.join(path, child[1]) for child in children if child[0]]
    files = [posixpath.join(path, child[1]) for child in children if not child[0]] 
    stack.extend(dirs[::-1]) # add dirs reversed so they are popped out in order

    # download all files in the directory
    for filepath in files:
        download(ftp, filepath, os.path.join(local_root, filepath.split(url.path,1)[-1]), 
                                             check_cwd=False)

# logout
ftp.quit()

---

---

您可以通过使用python ftp包装库（例如或

）进一步压缩此内容。您想下载所有可用的zip文件或特定的zip文件吗？我在根目录中看到多个目录。我需要下载所有可用的zip文件每个目录001、002、003…中的所有zip文件？是的。我知道它们有很多文件（例如，所有加拿大的DEM模型。仅次于俄罗斯的第二大国家）好的，我也得到了同样的错误。你读过这篇文章吗：我会尽力让它对你的案子起作用。一旦它工作，你可以遍历每个目录。你想下载所有可用的zip文件或特定的zip文件吗？我在根目录中看到多个目录。我需要下载所有可用的zip文件每个目录001、002、003…中的所有zip文件？是的。我知道它们有很多文件（例如，所有加拿大的DEM模型。仅次于俄罗斯的第二大国家）好的，我也得到了同样的错误。你读过这篇文章吗：我会尽力让它对你的案子起作用。一旦它工作，你可以遍历每个目录。你想下载所有可用的zip文件或特定的zip文件吗？我在根目录中看到多个目录。我需要下载所有可用的zip文件每个目录001、002、003…中的所有zip文件？是的。我知道它们有很多文件（例如，所有加拿大的DEM模型。仅次于俄罗斯的第二大国家）好的，我也得到了同样的错误。你读过这篇文章吗：我会尽力让它对你的案子起作用。一旦它工作，你可以遍历每个目录。你想下载所有可用的zip文件或特定的zip文件吗？我在根目录中看到多个目录。我需要下载所有可用的zip文件每个目录001、002、003…中的所有zip文件？是的。我知道它们有很多文件（例如，所有加拿大的DEM模型。仅次于俄罗斯的第二大国家）好的，我也得到了同样的错误。你读过这篇文章吗：我会尽力让它对你的案子起作用。一旦它工作，您就可以遍历每个目录。