下面的python函数使用print函数打印值，但如果返回字符串值则不返回任何值。任何人都可以帮助我如何从下面的函数返回字符串值。
csv_full_list = ['mycsv_0', 'mycsv_1']
def create_csv_name(comm, index):
global csv_full_list
if comm + '_' + str(index) in csv_full_list:
index += 1 # increment index by 1
create_csv_name(comm, index=index)
else:
print '%s_%i' % (comm, index)
return '%s_%i' % (comm, index)
print(create_csv_name('mycsv', 0))
输出预期：
mycsv_2
但返回：
没有任何
试试下面的代码。
csv_full_list = ['mycsv_0', 'mycsv_1']
def create_csv_name(comm, index):
global csv_full_list
result = True
print "ATTEMPT: COMM: {}, INDEX: {}".format(comm, index)
while result:
if comm + '_' + str(index) not in csv_full_list:
result = False
else:
index += 1 # increment index by 1
#print "--> Found COMM: {}, INDEX: {}".format(comm, index)
create_csv_name(comm, index=index)
if not result:
return "\n\nStopping at >> COMM: {}, INDEX: {}".format(comm, index)
# Call the def
print(create_csv_name('mycsv', 0))
第二种变化：
csv_full_list = ['mycsv_0', 'mycsv_1']
def create_csv_name(comm, index):
global csv_full_list
result = True
print "ATTEMPT: COMM: {}, INDEX: {}".format(comm, index)
if comm + '_' + str(index) not in csv_full_list:
return "\n\nStopping at >> COMM: {}, INDEX: {}".format(comm, index)
else:
index += 1 # increment index by 1
return create_csv_name(comm, index=index)
print(create_csv_name('mycsv', 0))
输出：
> python.exe .\sample.py
ATTEMPT: COMM: mycsv, INDEX: 0
ATTEMPT: COMM: mycsv, INDEX: 1
ATTEMPT: COMM: mycsv, INDEX: 2
ATTEMPT: COMM: mycsv, INDEX: 2
Stopping at >> COMM: mycsv, INDEX: 2
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我来说两句