python forloop vs map+lambda

forloop_vs_map+lambda.py

for t in content.findAll(class_=re.compile('.*btn.*')):
    t.decompose() # this works, undesired parts of content is decomposed

# ================================
    

[t.decompose() for t in content.findAll(class_=re.compile('.*btn.*'))] # this works

# ================================
# map uses generator, t.decompose() is not called until someone access t
# ================================

try:
    map(lambda t: t.decompose(), content.findAll(class_=re.compile('.*btn.*'))) # this does not work, the undesired parts are still here
except:
    pass

# ================================

def decompose_helper(tag):
    tag.decompose()

try:
    map(decompose_helper, content.findAll(class_=re.compile('.*btn.*'))) # this does not work, the undesired parts are still here
except:
    pass

# ================================

try:
    tmp = map(lambda t: t.decompose(), content.findAll(class_=re.compile('.*btn.*'))) # this works
    for t in tmp:
        print(tmp)
except:
    pass